diff --git a/src/agenda_culturel/forms.py b/src/agenda_culturel/forms.py
index 95a9329..9d48b15 100644
--- a/src/agenda_culturel/forms.py
+++ b/src/agenda_culturel/forms.py
@@ -264,7 +264,10 @@ class CategorisationRuleImportForm(ModelForm):
 
 class MultipleChoiceFieldAcceptAll(MultipleChoiceField):
     def validate(self, value):
-        pass
+        # check if each element is without "/"
+        for item in value:
+            if "/" in item:
+                raise ValidationError(_("The '/' character is not allowed."))
 
 
 class EventForm(GroupFormMixin, ModelForm):
diff --git a/src/agenda_culturel/locale/fr/LC_MESSAGES/django.po b/src/agenda_culturel/locale/fr/LC_MESSAGES/django.po
index 881428b..271b675 100644
--- a/src/agenda_culturel/locale/fr/LC_MESSAGES/django.po
+++ b/src/agenda_culturel/locale/fr/LC_MESSAGES/django.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: agenda_culturel\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2025-04-02 21:35+0200\n"
+"POT-Creation-Date: 2025-04-03 19:36+0200\n"
 "PO-Revision-Date: 2023-10-29 14:16+0000\n"
 "Last-Translator: Jean-Marie Favreau <jeanmarie.favreau@free.fr>\n"
 "Language-Team: Jean-Marie Favreau <jeanmarie.favreau@free.fr>\n"
@@ -142,12 +142,12 @@ msgstr "dernier créé d'abord"
 msgid "Imported from"
 msgstr "Importé depuis"
 
-#: agenda_culturel/filters.py:470 agenda_culturel/models.py:867
-#: agenda_culturel/models.py:2982
+#: agenda_culturel/filters.py:470 agenda_culturel/models.py:873
+#: agenda_culturel/models.py:2988
 msgid "Status"
 msgstr "Status"
 
-#: agenda_culturel/filters.py:471 agenda_culturel/models.py:2747
+#: agenda_culturel/filters.py:471 agenda_culturel/models.py:2753
 msgid "Closed"
 msgstr "Fermé"
 
@@ -156,7 +156,7 @@ msgid "Open"
 msgstr "Ouvert"
 
 #: agenda_culturel/filters.py:475 agenda_culturel/filters.py:476
-#: agenda_culturel/models.py:2741
+#: agenda_culturel/models.py:2747
 msgid "Spam"
 msgstr "Spam"
 
@@ -164,7 +164,7 @@ msgstr "Spam"
 msgid "Non spam"
 msgstr "Non spam"
 
-#: agenda_culturel/filters.py:481 agenda_culturel/models.py:2762
+#: agenda_culturel/filters.py:481 agenda_culturel/models.py:2768
 msgid "Type"
 msgstr "Type"
 
@@ -195,11 +195,11 @@ msgstr ""
 msgid "Your email"
 msgstr "Votre adresse email"
 
-#: agenda_culturel/forms.py:166 agenda_culturel/models.py:2729
+#: agenda_culturel/forms.py:166 agenda_culturel/models.py:2735
 msgid "Your email address"
 msgstr "Votre adresse email"
 
-#: agenda_culturel/forms.py:172 agenda_culturel/models.py:2754
+#: agenda_culturel/forms.py:172 agenda_culturel/models.py:2760
 msgid "Comments"
 msgstr "Commentaires"
 
@@ -214,20 +214,20 @@ msgstr ""
 msgid "Receive notification of publication or leave a message for moderation"
 msgstr "Être notifié de la publication ou laisser un message à la modération"
 
-#: agenda_culturel/forms.py:206 agenda_culturel/models.py:308
-#: agenda_culturel/models.py:875 agenda_culturel/models.py:2906
-#: agenda_culturel/models.py:3017
+#: agenda_culturel/forms.py:206 agenda_culturel/models.py:313
+#: agenda_culturel/models.py:881 agenda_culturel/models.py:2912
+#: agenda_culturel/models.py:3023
 msgid "Category"
 msgstr "Catégorie"
 
 #: agenda_culturel/forms.py:212 agenda_culturel/forms.py:245
 #: agenda_culturel/forms.py:288 agenda_culturel/forms.py:472
-#: agenda_culturel/models.py:361 agenda_culturel/models.py:992
+#: agenda_culturel/models.py:367 agenda_culturel/models.py:998
 msgid "Tags"
 msgstr "Étiquettes"
 
 #: agenda_culturel/forms.py:220 agenda_culturel/forms.py:637
-#: agenda_culturel/models.py:1122
+#: agenda_culturel/models.py:1128
 msgid "Event"
 msgstr "Événement"
 
@@ -266,13 +266,13 @@ msgstr "Cet événement est récurrent"
 msgid "Details"
 msgstr "Détails"
 
-#: agenda_culturel/forms.py:378 agenda_culturel/models.py:904
-#: agenda_culturel/models.py:2881
+#: agenda_culturel/forms.py:378 agenda_culturel/models.py:910
+#: agenda_culturel/models.py:2887
 msgid "Location"
 msgstr "Localisation"
 
-#: agenda_culturel/forms.py:383 agenda_culturel/models.py:106
-#: agenda_culturel/models.py:948
+#: agenda_culturel/forms.py:383 agenda_culturel/models.py:111
+#: agenda_culturel/models.py:954
 msgid "Illustration"
 msgstr "Illustration"
 
@@ -346,8 +346,8 @@ msgstr "Valeur de la version sélectionnée"
 msgid "Apply category {} to the event {}"
 msgstr "Appliquer la catégorie {} à l'événement {}"
 
-#: agenda_culturel/forms.py:863 agenda_culturel/models.py:692
-#: agenda_culturel/models.py:3069
+#: agenda_culturel/forms.py:863 agenda_culturel/models.py:698
+#: agenda_culturel/models.py:3075
 msgid "Place"
 msgstr "Lieu"
 
@@ -369,7 +369,7 @@ msgstr ""
 msgid "Header"
 msgstr "Entête"
 
-#: agenda_culturel/forms.py:920 agenda_culturel/models.py:654
+#: agenda_culturel/forms.py:920 agenda_culturel/models.py:660
 msgid "Address"
 msgstr "Adresse"
 
@@ -414,67 +414,71 @@ msgstr ""
 "la page n'était pas encore peuplée des événements, le temps de chargement a "
 "sans doute été trop court"
 
-#: agenda_culturel/models.py:64
+#: agenda_culturel/models.py:65
 msgid "mean"
 msgstr "moyenne"
 
-#: agenda_culturel/models.py:64
+#: agenda_culturel/models.py:65
 msgid "median"
 msgstr "médiane"
 
-#: agenda_culturel/models.py:64
+#: agenda_culturel/models.py:65
 msgid "maximum"
 msgstr "maximum"
 
-#: agenda_culturel/models.py:64
+#: agenda_culturel/models.py:65
 msgid "minimum"
 msgstr "minimum"
 
-#: agenda_culturel/models.py:64
+#: agenda_culturel/models.py:65
 msgid "stdev"
 msgstr "écart-type"
 
 #: agenda_culturel/models.py:69
+msgid "The '/' character is not allowed."
+msgstr "Le caractère '/' n'est pas autorisé."
+
+#: agenda_culturel/models.py:74
 msgid "Site name"
 msgstr "Nom du site"
 
-#: agenda_culturel/models.py:72
+#: agenda_culturel/models.py:77
 msgid "Site url"
 msgstr "URL du site"
 
-#: agenda_culturel/models.py:75
+#: agenda_culturel/models.py:80
 msgid "Site description"
 msgstr "Description du site"
 
-#: agenda_culturel/models.py:81
+#: agenda_culturel/models.py:86
 msgid "Keywords in html header"
 msgstr "Mots-clés dans l'entête html"
 
-#: agenda_culturel/models.py:86
+#: agenda_culturel/models.py:91
 msgid "Description in html header"
 msgstr "Description dans l'entête html"
 
-#: agenda_culturel/models.py:91
+#: agenda_culturel/models.py:96
 msgid "Google site verification value"
 msgstr "Valeur de vérification de site Google"
 
-#: agenda_culturel/models.py:98
+#: agenda_culturel/models.py:103
 msgid "Microsoft (bing) site verification value"
 msgstr "Valeur de vérification de site Microsoft (bing)"
 
-#: agenda_culturel/models.py:112
+#: agenda_culturel/models.py:117
 msgid "Illustration (development version)"
 msgstr "Illustration (version de développement)"
 
-#: agenda_culturel/models.py:145 agenda_culturel/models.py:148
+#: agenda_culturel/models.py:150 agenda_culturel/models.py:153
 msgid "Site Configuration"
 msgstr "Configuration du site"
 
-#: agenda_culturel/models.py:159
+#: agenda_culturel/models.py:164
 msgid "Expert moderation user"
 msgstr "Utilisateur expert en modération"
 
-#: agenda_culturel/models.py:161
+#: agenda_culturel/models.py:166
 msgid ""
 "This user is an expert in moderation, and the interface features additional "
 "functionalities."
@@ -482,102 +486,102 @@ msgstr ""
 "Cet utilisateur est un expert en modération, et l'interface comporte des "
 "fonctionnalités additionnelles."
 
-#: agenda_culturel/models.py:167 agenda_culturel/models.py:171
+#: agenda_culturel/models.py:172 agenda_culturel/models.py:176
 msgid "User profile"
 msgstr ""
 
-#: agenda_culturel/models.py:168
+#: agenda_culturel/models.py:173
 msgid "User profiles"
 msgstr ""
 
-#: agenda_culturel/models.py:191 agenda_culturel/models.py:238
-#: agenda_culturel/models.py:317 agenda_culturel/models.py:611
-#: agenda_culturel/models.py:652 agenda_culturel/models.py:758
-#: agenda_culturel/models.py:2721 agenda_culturel/models.py:2831
+#: agenda_culturel/models.py:196 agenda_culturel/models.py:243
+#: agenda_culturel/models.py:322 agenda_culturel/models.py:617
+#: agenda_culturel/models.py:658 agenda_culturel/models.py:764
+#: agenda_culturel/models.py:2727 agenda_culturel/models.py:2837
 msgid "Name"
 msgstr "Nom"
 
-#: agenda_culturel/models.py:192 agenda_culturel/models.py:238
+#: agenda_culturel/models.py:197 agenda_culturel/models.py:243
 msgid "Category name"
 msgstr "Nom de la catégorie"
 
-#: agenda_culturel/models.py:197
+#: agenda_culturel/models.py:202
 msgid "Content"
 msgstr "Contenu"
 
-#: agenda_culturel/models.py:198
+#: agenda_culturel/models.py:203
 msgid "Text as shown to the visitors"
 msgstr "Texte tel que présenté aux visiteureuses"
 
-#: agenda_culturel/models.py:202
+#: agenda_culturel/models.py:207
 msgid "URL path"
 msgstr "Chemin URL"
 
-#: agenda_culturel/models.py:203
+#: agenda_culturel/models.py:208
 msgid "URL path where the content is included."
 msgstr "Chemin URL où le contenu est présent."
 
-#: agenda_culturel/models.py:207
+#: agenda_culturel/models.py:212
 msgid "Static content"
 msgstr "Contenu statique"
 
-#: agenda_culturel/models.py:208
+#: agenda_culturel/models.py:213
 msgid "Static contents"
 msgstr "Contenus statiques"
 
-#: agenda_culturel/models.py:244
+#: agenda_culturel/models.py:249
 msgid "Color"
 msgstr "Couleur"
 
-#: agenda_culturel/models.py:245
+#: agenda_culturel/models.py:250
 msgid "Color used as background for the category"
 msgstr "Couleur utilisée comme fond de la catégorie"
 
-#: agenda_culturel/models.py:251
+#: agenda_culturel/models.py:256
 msgid "Pictogram"
 msgstr "Pictogramme"
 
-#: agenda_culturel/models.py:252
+#: agenda_culturel/models.py:257
 msgid "Pictogram of the category (svg format)"
 msgstr "Pictogramme de la catégorie (format svg)"
 
-#: agenda_culturel/models.py:259
+#: agenda_culturel/models.py:264
 msgid "Position for ordering categories"
 msgstr "Position pour ordonner les catégories"
 
-#: agenda_culturel/models.py:309
+#: agenda_culturel/models.py:314
 msgid "Categories"
 msgstr "Catégories"
 
-#: agenda_culturel/models.py:318
+#: agenda_culturel/models.py:323
 msgid "Tag name"
 msgstr "Nom de l'étiquette"
 
-#: agenda_culturel/models.py:324 agenda_culturel/models.py:675
-#: agenda_culturel/models.py:774 agenda_culturel/models.py:931
+#: agenda_culturel/models.py:330 agenda_culturel/models.py:681
+#: agenda_culturel/models.py:780 agenda_culturel/models.py:937
 msgid "Description"
 msgstr "Description"
 
-#: agenda_culturel/models.py:325
+#: agenda_culturel/models.py:331
 msgid "Description of the tag"
 msgstr "Description de l'étiquette"
 
-#: agenda_culturel/models.py:331 agenda_culturel/models.py:2688
-#: agenda_culturel/models.py:2735
+#: agenda_culturel/models.py:337 agenda_culturel/models.py:2694
+#: agenda_culturel/models.py:2741
 msgid "Message"
 msgstr "Message"
 
-#: agenda_culturel/models.py:333
+#: agenda_culturel/models.py:339
 msgid "Message displayed to the user on each event associated with this tag."
 msgstr ""
 "Message affiché à l'utilisateur sur chaque événement associé à cette "
 "étiquette."
 
-#: agenda_culturel/models.py:340
+#: agenda_culturel/models.py:346
 msgid "Principal"
 msgstr "Principal"
 
-#: agenda_culturel/models.py:342
+#: agenda_culturel/models.py:348
 msgid ""
 "This tag is highlighted as a main tag for visitors, particularly in the "
 "filter."
@@ -585,91 +589,91 @@ msgstr ""
 "Cette étiquette est mise en avant comme étiquette principale pour les "
 "visiteurs, en particulier dans le filtre."
 
-#: agenda_culturel/models.py:348
+#: agenda_culturel/models.py:354
 msgid "In excluded suggestions"
 msgstr "Dans les suggestions d'exclusion"
 
-#: agenda_culturel/models.py:349
+#: agenda_culturel/models.py:355
 msgid "This tag will be part of the excluded suggestions."
 msgstr "Cette étiquette fera partie des suggestions d'exclusion."
 
-#: agenda_culturel/models.py:354
+#: agenda_culturel/models.py:360
 msgid "In included suggestions"
 msgstr "Dans les suggestions d'inclusion."
 
-#: agenda_culturel/models.py:355
+#: agenda_culturel/models.py:361
 msgid "This tag will be part of the included suggestions."
 msgstr "Cette étiquette fera partie des suggestions d'inclusion."
 
-#: agenda_culturel/models.py:360
+#: agenda_culturel/models.py:366
 msgid "Tag"
 msgstr "Étiquette"
 
-#: agenda_culturel/models.py:449
+#: agenda_culturel/models.py:455
 msgid "Suggestions"
 msgstr "Suggestions"
 
-#: agenda_culturel/models.py:450
+#: agenda_culturel/models.py:456
 msgid "Others"
 msgstr "Autres"
 
-#: agenda_culturel/models.py:463
+#: agenda_culturel/models.py:469
 msgid "Representative event"
 msgstr "Événement représentatif"
 
-#: agenda_culturel/models.py:465
+#: agenda_culturel/models.py:471
 msgid "This event is the representative event of the duplicated events group"
 msgstr ""
 "Cet événement est l'événement représentatif du groupe d'événements dupliqués."
 
-#: agenda_culturel/models.py:473 agenda_culturel/models.py:474
+#: agenda_culturel/models.py:479 agenda_culturel/models.py:480
 msgid "Duplicated events"
 msgstr "Événements dupliqués"
 
-#: agenda_culturel/models.py:612
+#: agenda_culturel/models.py:618
 msgid "Name of the location"
 msgstr "Nom de la position"
 
-#: agenda_culturel/models.py:623
+#: agenda_culturel/models.py:629
 msgid "Main"
 msgstr "Principale"
 
-#: agenda_culturel/models.py:625
+#: agenda_culturel/models.py:631
 msgid "This location is one of the main locations (shown first higher values)."
 msgstr ""
 "Cette position est une position principale (affichage en premier des plus "
 "grandes valeurs)."
 
-#: agenda_culturel/models.py:630
+#: agenda_culturel/models.py:636
 msgid "Suggested distance (km)"
 msgstr ""
 
-#: agenda_culturel/models.py:632
+#: agenda_culturel/models.py:638
 msgid ""
 "If this distance is given, this location is part of the suggested filters."
 msgstr ""
 
-#: agenda_culturel/models.py:641
+#: agenda_culturel/models.py:647
 msgid "Reference location"
 msgstr "Position de référence"
 
-#: agenda_culturel/models.py:642
+#: agenda_culturel/models.py:648
 msgid "Reference locations"
 msgstr "Positions de référence"
 
-#: agenda_culturel/models.py:652
+#: agenda_culturel/models.py:658
 msgid "Name of the place"
 msgstr "Nom du lieu"
 
-#: agenda_culturel/models.py:655
+#: agenda_culturel/models.py:661
 msgid "Address of this place (without city name)"
 msgstr "Adresse de ce lieu (sans le nom de la ville)"
 
-#: agenda_culturel/models.py:660
+#: agenda_culturel/models.py:666
 msgid "Postcode"
 msgstr "Code postal"
 
-#: agenda_culturel/models.py:662
+#: agenda_culturel/models.py:668
 msgid ""
 "The post code is not displayed, but makes it easier to find an address when "
 "you enter it."
@@ -677,23 +681,23 @@ msgstr ""
 "Le code postal ne sera pas affiché, mais facilite la recherche d'adresse au "
 "moment de la saisie."
 
-#: agenda_culturel/models.py:667
+#: agenda_culturel/models.py:673
 msgid "City"
 msgstr "Ville"
 
-#: agenda_culturel/models.py:667
+#: agenda_culturel/models.py:673
 msgid "City name"
 msgstr "Nom de la ville"
 
-#: agenda_culturel/models.py:676
+#: agenda_culturel/models.py:682
 msgid "Description of the place, including accessibility."
 msgstr "Description du lieu, inclus l'accessibilité."
 
-#: agenda_culturel/models.py:683
+#: agenda_culturel/models.py:689
 msgid "Alternative names"
 msgstr "Noms alternatifs"
 
-#: agenda_culturel/models.py:685
+#: agenda_culturel/models.py:691
 msgid ""
 "Alternative names or addresses used to match a place with the free-form "
 "location of an event."
@@ -701,31 +705,31 @@ msgstr ""
 "Noms et adresses alternatives qui seront utilisées pour associer une adresse "
 "avec la localisation en forme libre d'un événement"
 
-#: agenda_culturel/models.py:693
+#: agenda_culturel/models.py:699
 msgid "Places"
 msgstr "Lieux"
 
-#: agenda_culturel/models.py:759
+#: agenda_culturel/models.py:765
 msgid "Organisation name"
 msgstr "Nom de l'organisme"
 
-#: agenda_culturel/models.py:766
+#: agenda_culturel/models.py:772
 msgid "Website"
 msgstr "Site internet"
 
-#: agenda_culturel/models.py:767
+#: agenda_culturel/models.py:773
 msgid "Website of the organisation"
 msgstr "Site internet de l'organisme"
 
-#: agenda_culturel/models.py:775
+#: agenda_culturel/models.py:781
 msgid "Description of the organisation."
 msgstr "Description de l'organisme"
 
-#: agenda_culturel/models.py:782
+#: agenda_culturel/models.py:788
 msgid "Principal place"
 msgstr "Lieu principal"
 
-#: agenda_culturel/models.py:784
+#: agenda_culturel/models.py:790
 msgid ""
 "Place mainly associated with this organizer. Mainly used if there is a "
 "similarity in the name, to avoid redundant displays."
@@ -733,75 +737,75 @@ msgstr ""
 "Lieu principalement associé à cet organisateur. Principalement utilisé s'il "
 "y a une similarité de nom, pour éviter les affichages redondants."
 
-#: agenda_culturel/models.py:792
+#: agenda_culturel/models.py:798
 msgid "Organisation"
 msgstr "Organisme"
 
-#: agenda_culturel/models.py:793
+#: agenda_culturel/models.py:799
 msgid "Organisations"
 msgstr "Organismes"
 
-#: agenda_culturel/models.py:804 agenda_culturel/models.py:2876
+#: agenda_culturel/models.py:810 agenda_culturel/models.py:2882
 msgid "Published"
 msgstr "Publié"
 
-#: agenda_culturel/models.py:805
+#: agenda_culturel/models.py:811
 msgid "Draft"
 msgstr "Brouillon"
 
-#: agenda_culturel/models.py:806
+#: agenda_culturel/models.py:812
 msgid "Trash"
 msgstr "Corbeille"
 
-#: agenda_culturel/models.py:816
+#: agenda_culturel/models.py:822
 msgid "Author currently editing/moderating the event"
 msgstr ""
 
-#: agenda_culturel/models.py:826
+#: agenda_culturel/models.py:832
 msgid "Author of the event creation"
 msgstr "Auteur de la création de l'événement"
 
-#: agenda_culturel/models.py:835
+#: agenda_culturel/models.py:841
 msgid "Author of the last importation"
 msgstr "Auteur de la dernière importation"
 
-#: agenda_culturel/models.py:844
+#: agenda_culturel/models.py:850
 msgid "Author of the last modification"
 msgstr "Auteur de la dernière modification"
 
-#: agenda_culturel/models.py:853
+#: agenda_culturel/models.py:859
 msgid "Author of the last moderation"
 msgstr "Auteur de la dernière modération"
 
-#: agenda_culturel/models.py:864
+#: agenda_culturel/models.py:870
 msgid "Title"
 msgstr "Titre"
 
-#: agenda_culturel/models.py:881
+#: agenda_culturel/models.py:887
 msgid "Start day"
 msgstr "Date de début"
 
-#: agenda_culturel/models.py:883
+#: agenda_culturel/models.py:889
 msgid "Start time"
 msgstr "Heure de début"
 
-#: agenda_culturel/models.py:889
+#: agenda_culturel/models.py:895
 msgid "End day"
 msgstr "Date de fin"
 
-#: agenda_culturel/models.py:893
+#: agenda_culturel/models.py:899
 msgid "End time"
 msgstr "Heure de fin"
 
-#: agenda_culturel/models.py:896
+#: agenda_culturel/models.py:902
 msgid "Recurrence"
 msgstr "Récurrence"
 
-#: agenda_culturel/models.py:910
+#: agenda_culturel/models.py:916
 msgid "Location (free form)"
 msgstr "Localisation (forme libre)"
 
-#: agenda_culturel/models.py:912
+#: agenda_culturel/models.py:918
 msgid ""
 "Address of the event in case its not available in the already known places "
 "(free form)"
@@ -809,11 +813,11 @@ msgstr ""
 "Adresse d'un événement si elle n'est pas déjà présente dans la liste des "
 "lieux disponibles (forme libre)"
 
-#: agenda_culturel/models.py:921
+#: agenda_culturel/models.py:927
 msgid "Local event"
 msgstr "Événement de portée locale"
 
-#: agenda_culturel/models.py:923
+#: agenda_culturel/models.py:929
 msgid ""
 "If the event is a local event, it will not be proposed by default in daily, "
 "weekly or monthly views, unless the user has explicitly indicated that he "
@@ -823,11 +827,11 @@ msgstr ""
 "les vues quotidiennes, hebdomadaires ou mensuelles, sauf si l'utilisateur a "
 "explicitement indiqué qu'il souhaite voir ces événements."
 
-#: agenda_culturel/models.py:939
+#: agenda_culturel/models.py:945
 msgid "Organisers"
 msgstr "Organisateurs"
 
-#: agenda_culturel/models.py:941
+#: agenda_culturel/models.py:947
 msgid ""
 "list of event organisers. Organizers will only be displayed if one of them "
 "does not normally use the venue."
@@ -835,112 +839,112 @@ msgstr ""
 "Liste des organisateurs de l'événements. Les organisateurs seront affichés "
 "uniquement si au moins un d'entre eux n'utilise pas habituellement le lieu."
 
-#: agenda_culturel/models.py:955
+#: agenda_culturel/models.py:961
 msgid "Illustration (URL)"
 msgstr "Illustration (URL)"
 
-#: agenda_culturel/models.py:956
+#: agenda_culturel/models.py:962
 msgid "External URL of the illustration image"
 msgstr "URL externe de l'image illustrative"
 
-#: agenda_culturel/models.py:962
+#: agenda_culturel/models.py:968
 msgid "Illustration description"
 msgstr "Description de l'illustration"
 
-#: agenda_culturel/models.py:963
+#: agenda_culturel/models.py:969
 msgid "Alternative text used by screen readers for the image"
 msgstr "Texte alternatif utiliser par les lecteurs d'écrans pour l'image"
 
-#: agenda_culturel/models.py:971
+#: agenda_culturel/models.py:977
 msgid "Importation source"
 msgstr "Source d'importation"
 
-#: agenda_culturel/models.py:972
+#: agenda_culturel/models.py:978
 msgid "Importation source used to detect removed entries."
 msgstr "Source d'importation utilisée pour détecter les éléments supprimés/"
 
-#: agenda_culturel/models.py:978
+#: agenda_culturel/models.py:984
 msgid "UUIDs"
 msgstr "UUIDs"
 
-#: agenda_culturel/models.py:979
+#: agenda_culturel/models.py:985
 msgid "UUIDs from import to detect duplicated entries."
 msgstr "UUIDs utilisés pendant l'import pour détecter les entrées dupliquées"
 
-#: agenda_culturel/models.py:985
+#: agenda_culturel/models.py:991
 msgid "Online sources or ticketing"
 msgstr "Sources en ligne ou billetterie"
 
-#: agenda_culturel/models.py:999
+#: agenda_culturel/models.py:1005
 msgid "Other versions"
 msgstr ""
 
-#: agenda_culturel/models.py:1123
+#: agenda_culturel/models.py:1129
 msgid "Events"
 msgstr "Événements"
 
-#: agenda_culturel/models.py:1284
+#: agenda_culturel/models.py:1290
 msgid "recurrent import"
 msgstr "import récurrent"
 
-#: agenda_culturel/models.py:1286
+#: agenda_culturel/models.py:1292
 msgid "a non authenticated user"
 msgstr "un utilisateur non connecté"
 
-#: agenda_culturel/models.py:1769
+#: agenda_culturel/models.py:1775
 msgid "Your event has been published"
 msgstr "Ton événement a été publié"
 
-#: agenda_culturel/models.py:1774
+#: agenda_culturel/models.py:1780
 msgid "Your message has not been retained"
 msgstr "Ton événement n'a pas été retenu"
 
-#: agenda_culturel/models.py:1862 agenda_culturel/models.py:2685
+#: agenda_culturel/models.py:1868 agenda_culturel/models.py:2691
 msgid "Warning"
 msgstr "Warning"
 
-#: agenda_culturel/models.py:1864 agenda_culturel/models.py:1970
+#: agenda_culturel/models.py:1870 agenda_culturel/models.py:1976
 msgid "the date has not been imported correctly."
 msgstr "la date n'a pas été importée correctement."
 
-#: agenda_culturel/models.py:1952
+#: agenda_culturel/models.py:1958
 msgid "during import process"
 msgstr "pendant le processus d'import"
 
-#: agenda_culturel/models.py:1968 agenda_culturel/models.py:1978
-#: agenda_culturel/models.py:1989
+#: agenda_culturel/models.py:1974 agenda_culturel/models.py:1984
+#: agenda_culturel/models.py:1995
 msgid "warning"
 msgstr "attention"
 
-#: agenda_culturel/models.py:1980
+#: agenda_culturel/models.py:1986
 msgid "the title has not been imported correctly."
 msgstr "le titre n'a pas été importé correctement."
 
-#: agenda_culturel/models.py:1992
+#: agenda_culturel/models.py:1998
 msgid "The import was unable to find an event in the page."
 msgstr "L'import a été incapable de trouver un événement dans la page."
 
-#: agenda_culturel/models.py:2340
+#: agenda_culturel/models.py:2346
 msgid "Updated field(s): "
 msgstr "Champ(s) mis à jour: "
 
-#: agenda_culturel/models.py:2344
+#: agenda_culturel/models.py:2350
 msgid "Update"
 msgstr "Mise à jour"
 
-#: agenda_culturel/models.py:2345
+#: agenda_culturel/models.py:2351
 msgid "update process"
 msgstr "processus de mise à jour"
 
-#: agenda_culturel/models.py:2414
+#: agenda_culturel/models.py:2420
 msgid "Import"
 msgstr "Import"
 
-#: agenda_culturel/models.py:2415
+#: agenda_culturel/models.py:2421
 msgid "import process"
 msgstr "processus d'import"
 
-#: agenda_culturel/models.py:2417
+#: agenda_culturel/models.py:2423
 msgid ""
 "The duration of the event is a little too long for direct publication. "
 "Moderators can choose to publish it or not."
@@ -948,191 +952,191 @@ msgstr ""
 "La durée de l'événement est un peu trop longue pour qu'il soit publié "
 "directement. Les modérateurs peuvent choisir de le publier ou non."
 
-#: agenda_culturel/models.py:2676
+#: agenda_culturel/models.py:2682
 msgid "From contributor"
 msgstr "D'un·e contributeurice"
 
-#: agenda_culturel/models.py:2677
+#: agenda_culturel/models.py:2683
 msgid "Import process"
 msgstr "Processus d'import"
 
-#: agenda_culturel/models.py:2678
+#: agenda_culturel/models.py:2684
 msgid "Update process"
 msgstr "Processus de mise à jour"
 
-#: agenda_culturel/models.py:2679
+#: agenda_culturel/models.py:2685
 msgid "Contact form"
 msgstr "Formulaire de contact"
 
-#: agenda_culturel/models.py:2680
+#: agenda_culturel/models.py:2686
 msgid "Event report"
 msgstr "Signalemet d'événement"
 
-#: agenda_culturel/models.py:2683
+#: agenda_culturel/models.py:2689
 msgid "From contributor (without message)"
 msgstr "D'un·e contributeurice (sans message)"
 
-#: agenda_culturel/models.py:2689
+#: agenda_culturel/models.py:2695
 msgid "Messages"
 msgstr "Messages"
 
-#: agenda_culturel/models.py:2698
+#: agenda_culturel/models.py:2704
 msgid "Subject"
 msgstr "Sujet"
 
-#: agenda_culturel/models.py:2699
+#: agenda_culturel/models.py:2705
 msgid "The subject of your message"
 msgstr "Sujet de votre message"
 
-#: agenda_culturel/models.py:2705
+#: agenda_culturel/models.py:2711
 msgid "Related event"
 msgstr "Événement associé"
 
-#: agenda_culturel/models.py:2706
+#: agenda_culturel/models.py:2712
 msgid "The message is associated with this event."
 msgstr "Le message est associé à cet événement."
 
-#: agenda_culturel/models.py:2714
+#: agenda_culturel/models.py:2720
 msgid "Author of the message"
 msgstr "Auteur du message"
 
-#: agenda_culturel/models.py:2722
+#: agenda_culturel/models.py:2728
 msgid "Your name"
 msgstr "Votre nom"
 
-#: agenda_culturel/models.py:2728
+#: agenda_culturel/models.py:2734
 msgid "Email address"
 msgstr "Adresse email"
 
-#: agenda_culturel/models.py:2735
+#: agenda_culturel/models.py:2741
 msgid "Your message"
 msgstr "Votre message"
 
-#: agenda_culturel/models.py:2742
+#: agenda_culturel/models.py:2748
 msgid "This message is a spam."
 msgstr "Ce message est un spam."
 
-#: agenda_culturel/models.py:2749
+#: agenda_culturel/models.py:2755
 msgid "this message has been processed and no longer needs to be handled"
 msgstr "Ce message a été traité et ne nécessite plus d'être pris en charge"
 
-#: agenda_culturel/models.py:2755
+#: agenda_culturel/models.py:2761
 msgid "Comments on the message from the moderation team"
 msgstr "Commentaires sur ce message par l'équipe de modération"
 
-#: agenda_culturel/models.py:2788 agenda_culturel/models.py:2964
+#: agenda_culturel/models.py:2794 agenda_culturel/models.py:2970
 msgid "Recurrent import"
 msgstr "Import récurrent"
 
-#: agenda_culturel/models.py:2789
+#: agenda_culturel/models.py:2795
 msgid "Recurrent imports"
 msgstr "Imports récurrents"
 
-#: agenda_culturel/models.py:2793
+#: agenda_culturel/models.py:2799
 msgid "ical"
 msgstr "ical"
 
-#: agenda_culturel/models.py:2794
+#: agenda_culturel/models.py:2800
 msgid "ical no busy"
 msgstr "ical sans busy"
 
-#: agenda_culturel/models.py:2795
+#: agenda_culturel/models.py:2801
 msgid "ical no VC"
 msgstr "ical sans VC"
 
-#: agenda_culturel/models.py:2796
+#: agenda_culturel/models.py:2802
 msgid "ical naive timezone"
 msgstr "ical timezone naïve"
 
-#: agenda_culturel/models.py:2797
+#: agenda_culturel/models.py:2803
 msgid "lacoope.org"
 msgstr "lacoope.org"
 
-#: agenda_culturel/models.py:2798
+#: agenda_culturel/models.py:2804
 msgid "la comédie"
 msgstr "la comédie"
 
-#: agenda_culturel/models.py:2799
+#: agenda_culturel/models.py:2805
 msgid "le fotomat"
 msgstr "le fotomat"
 
-#: agenda_culturel/models.py:2800
+#: agenda_culturel/models.py:2806
 msgid "la puce à l'oreille"
 msgstr "la puce à loreille"
 
-#: agenda_culturel/models.py:2801
+#: agenda_culturel/models.py:2807
 msgid "Plugin wordpress MEC"
 msgstr "Plugin wordpress MEC"
 
-#: agenda_culturel/models.py:2802
+#: agenda_culturel/models.py:2808
 msgid "Événements d'une page FB"
 msgstr "Événements d'une page FB"
 
-#: agenda_culturel/models.py:2803
+#: agenda_culturel/models.py:2809
 msgid "Billetterie Clermont-Ferrand"
 msgstr ""
 
-#: agenda_culturel/models.py:2804
+#: agenda_culturel/models.py:2810
 msgid "Arachnée concert"
 msgstr "Arachnée concert"
 
-#: agenda_culturel/models.py:2805
+#: agenda_culturel/models.py:2811
 msgid "Le Rio"
 msgstr "Le Rio"
 
-#: agenda_culturel/models.py:2806
+#: agenda_culturel/models.py:2812
 msgid "La Raymonde"
 msgstr "La Raymone"
 
-#: agenda_culturel/models.py:2807
+#: agenda_culturel/models.py:2813
 msgid "Agenda apidae tourisme"
 msgstr "Agenda apidae tourisme"
 
-#: agenda_culturel/models.py:2808
+#: agenda_culturel/models.py:2814
 msgid "Agenda iguana (médiathèques)"
 msgstr "Agenda iguana (médiathèques)"
 
-#: agenda_culturel/models.py:2809
+#: agenda_culturel/models.py:2815
 msgid "Mille formes"
 msgstr "Mille Formes"
 
-#: agenda_culturel/models.py:2810
+#: agenda_culturel/models.py:2816
 msgid "Les Amis du Temps des Cerises"
 msgstr "Les Amis du Temps des Cerises"
 
-#: agenda_culturel/models.py:2811
+#: agenda_culturel/models.py:2817
 msgid "Mobilizon"
 msgstr "Mobilizon"
 
-#: agenda_culturel/models.py:2812
+#: agenda_culturel/models.py:2818
 msgid "Le caméléon"
 msgstr ""
 
-#: agenda_culturel/models.py:2815
+#: agenda_culturel/models.py:2821
 msgid "simple"
 msgstr "simple"
 
-#: agenda_culturel/models.py:2816
+#: agenda_culturel/models.py:2822
 msgid "Headless Chromium"
 msgstr "chromium sans interface"
 
-#: agenda_culturel/models.py:2819
+#: agenda_culturel/models.py:2825
 msgid "Headless Chromium (pause)"
 msgstr "chromium sans interface (pause)"
 
-#: agenda_culturel/models.py:2825
+#: agenda_culturel/models.py:2831
 msgid "daily"
 msgstr "chaque jour"
 
-#: agenda_culturel/models.py:2827
+#: agenda_culturel/models.py:2833
 msgid "weekly"
 msgstr "chaque semaine"
 
-#: agenda_culturel/models.py:2828
+#: agenda_culturel/models.py:2834
 msgid "never"
 msgstr "jamais"
 
-#: agenda_culturel/models.py:2833
+#: agenda_culturel/models.py:2839
 msgid ""
 "Recurrent import name. Be careful to choose a name that is easy to "
 "understand, as it will be public and displayed on the sites About page."
@@ -1140,151 +1144,151 @@ msgstr ""
 "Nom de l'import récurrent. Attention à choisir un nom compréhensible, car il "
 "sera public, et affiché sur la page à propos du site."
 
-#: agenda_culturel/models.py:2840
+#: agenda_culturel/models.py:2846
 msgid "Processor"
 msgstr "Processeur"
 
-#: agenda_culturel/models.py:2846
+#: agenda_culturel/models.py:2852
 msgid "Downloader"
 msgstr "Téléchargeur"
 
-#: agenda_culturel/models.py:2853
+#: agenda_culturel/models.py:2859
 msgid "Import recurrence"
 msgstr "Récurrence d'import"
 
-#: agenda_culturel/models.py:2860
+#: agenda_culturel/models.py:2866
 msgid "Source"
 msgstr "Source"
 
-#: agenda_culturel/models.py:2861
+#: agenda_culturel/models.py:2867
 msgid "URL of the source document"
 msgstr "URL du document source"
 
-#: agenda_culturel/models.py:2866
+#: agenda_culturel/models.py:2872
 msgid "Browsable url"
 msgstr "URL navigable"
 
-#: agenda_culturel/models.py:2868
+#: agenda_culturel/models.py:2874
 msgid "URL of the corresponding document that will be shown to visitors."
 msgstr "URL correspondant au document et qui sera montrée aux visiteurs"
 
-#: agenda_culturel/models.py:2877
+#: agenda_culturel/models.py:2883
 msgid "Status of each imported event (published or draft)"
 msgstr "Status de chaque événement importé (publié ou brouillon)"
 
-#: agenda_culturel/models.py:2882
+#: agenda_culturel/models.py:2888
 msgid "Address for each imported event"
 msgstr "Adresse de chaque événement importé"
 
-#: agenda_culturel/models.py:2889
+#: agenda_culturel/models.py:2895
 msgid "Force location"
 msgstr "Focer la localisation"
 
-#: agenda_culturel/models.py:2890
+#: agenda_culturel/models.py:2896
 msgid "force location even if another is detected."
 msgstr "Forcer la localisation même si une autre a été détectée."
 
-#: agenda_culturel/models.py:2896
+#: agenda_culturel/models.py:2902
 msgid "Organiser"
 msgstr "Organisateur"
 
-#: agenda_culturel/models.py:2897
+#: agenda_culturel/models.py:2903
 msgid "Organiser of each imported event"
 msgstr "Organisateur de chaque événement importé"
 
-#: agenda_culturel/models.py:2907
+#: agenda_culturel/models.py:2913
 msgid "Category of each imported event"
 msgstr "Catégorie de chaque événement importé"
 
-#: agenda_culturel/models.py:2915
+#: agenda_culturel/models.py:2921
 msgid "Tags for each imported event"
 msgstr "Étiquettes de chaque événement importé"
 
-#: agenda_culturel/models.py:2916
+#: agenda_culturel/models.py:2922
 msgid "A list of tags that describe each imported event."
 msgstr "Une liste d'étiquettes décrivant chaque événement importé"
 
-#: agenda_culturel/models.py:2945
+#: agenda_culturel/models.py:2951
 msgid "Running"
 msgstr "En cours"
 
-#: agenda_culturel/models.py:2946
+#: agenda_culturel/models.py:2952
 msgid "Canceled"
 msgstr "Annulé"
 
-#: agenda_culturel/models.py:2947
+#: agenda_culturel/models.py:2953
 msgid "Success"
 msgstr "Succès"
 
-#: agenda_culturel/models.py:2948
+#: agenda_culturel/models.py:2954
 msgid "Failed"
 msgstr "Erreur"
 
-#: agenda_culturel/models.py:2951
+#: agenda_culturel/models.py:2957
 msgid "Batch importation"
 msgstr "Importation par lot"
 
-#: agenda_culturel/models.py:2952
+#: agenda_culturel/models.py:2958
 msgid "Batch importations"
 msgstr "Importations par lot"
 
-#: agenda_culturel/models.py:2965
+#: agenda_culturel/models.py:2971
 msgid "Reference to the recurrent import processing"
 msgstr "Référence du processus d'import récurrent"
 
-#: agenda_culturel/models.py:2973
+#: agenda_culturel/models.py:2979
 msgid "URL (if not recurrent import)"
 msgstr "URL (si pas d'import récurrent)"
 
-#: agenda_culturel/models.py:2974
+#: agenda_culturel/models.py:2980
 msgid "Source URL if no RecurrentImport is associated."
 msgstr "URL source si aucun import récurrent n'est associé"
 
-#: agenda_culturel/models.py:2989
+#: agenda_culturel/models.py:2995
 msgid "Error message"
 msgstr "Votre message"
 
-#: agenda_culturel/models.py:2993
+#: agenda_culturel/models.py:2999
 msgid "Number of collected events"
 msgstr "Nombre d'événements collectés"
 
-#: agenda_culturel/models.py:2996
+#: agenda_culturel/models.py:3002
 msgid "Number of imported events"
 msgstr "Nombre d'événements importés"
 
-#: agenda_culturel/models.py:2999
+#: agenda_culturel/models.py:3005
 msgid "Number of updated events"
 msgstr "Nombre d'événements mis à jour"
 
-#: agenda_culturel/models.py:3002
+#: agenda_culturel/models.py:3008
 msgid "Number of removed events"
 msgstr "Nombre d'événements supprimés"
 
-#: agenda_culturel/models.py:3010
+#: agenda_culturel/models.py:3016
 msgid "Weight"
 msgstr "Poids"
 
-#: agenda_culturel/models.py:3011
+#: agenda_culturel/models.py:3017
 msgid "The lower is the weight, the earlier the filter is applied"
 msgstr "Plus le poids est léger, plus le filtre sera appliqué tôt"
 
-#: agenda_culturel/models.py:3018
+#: agenda_culturel/models.py:3024
 msgid "Category applied to the event"
 msgstr "Catégorie appliquée à l'événement"
 
-#: agenda_culturel/models.py:3023
+#: agenda_culturel/models.py:3029
 msgid "Contained in the title"
 msgstr "Contenu dans le titre"
 
-#: agenda_culturel/models.py:3024
+#: agenda_culturel/models.py:3030
 msgid "Text contained in the event title"
 msgstr "Texte contenu dans le titre de l'événement"
 
-#: agenda_culturel/models.py:3030
+#: agenda_culturel/models.py:3036
 msgid "Exact title extract"
 msgstr "Extrait exact du titre"
 
-#: agenda_culturel/models.py:3032
+#: agenda_culturel/models.py:3038
 msgid ""
 "If checked, the extract will be searched for in the title using the exact "
 "form (capitals, accents)."
@@ -1292,19 +1296,19 @@ msgstr ""
 "Si coché, l'extrait sera recherché dans le titre en utilisant la forme "
 "exacte (majuscules, accents)"
 
-#: agenda_culturel/models.py:3038
+#: agenda_culturel/models.py:3044
 msgid "Contained in the description"
 msgstr "Contenu dans la description"
 
-#: agenda_culturel/models.py:3039
+#: agenda_culturel/models.py:3045
 msgid "Text contained in the description"
 msgstr "Texte contenu dans la description"
 
-#: agenda_culturel/models.py:3045
+#: agenda_culturel/models.py:3051
 msgid "Exact description extract"
 msgstr "Extrait exact de description"
 
-#: agenda_culturel/models.py:3047
+#: agenda_culturel/models.py:3053
 msgid ""
 "If checked, the extract will be searched for in the description using the "
 "exact form (capitals, accents)."
@@ -1312,19 +1316,19 @@ msgstr ""
 "Si coché, l'extrait sera recherché dans la description en utilisant la forme "
 "exacte (majuscules, accents)"
 
-#: agenda_culturel/models.py:3053
+#: agenda_culturel/models.py:3059
 msgid "Contained in the location"
 msgstr "Contenu dans la localisation"
 
-#: agenda_culturel/models.py:3054
+#: agenda_culturel/models.py:3060
 msgid "Text contained in the event location"
 msgstr "Texte contenu dans la localisation de l'événement"
 
-#: agenda_culturel/models.py:3060
+#: agenda_culturel/models.py:3066
 msgid "Exact location extract"
 msgstr "Extrait exact de localisation"
 
-#: agenda_culturel/models.py:3062
+#: agenda_culturel/models.py:3068
 msgid ""
 "If checked, the extract will be searched for in the location using the exact "
 "form (capitals, accents)."
@@ -1332,15 +1336,15 @@ msgstr ""
 "Si coché, l'extrait sera recherché dans la localisation en utilisant la "
 "forme exacte (majuscules, accents)"
 
-#: agenda_culturel/models.py:3070
+#: agenda_culturel/models.py:3076
 msgid "Location from place"
 msgstr "Localisation depuis le lieu"
 
-#: agenda_culturel/models.py:3079
+#: agenda_culturel/models.py:3085
 msgid "Categorisation rule"
 msgstr "Règle de catégorisation"
 
-#: agenda_culturel/models.py:3080
+#: agenda_culturel/models.py:3086
 msgid "Categorisation rules"
 msgstr "Règles de catégorisation"
 
diff --git a/src/agenda_culturel/migrations/0163_alter_tag_name.py b/src/agenda_culturel/migrations/0163_alter_tag_name.py
new file mode 100644
index 0000000..7dba70d
--- /dev/null
+++ b/src/agenda_culturel/migrations/0163_alter_tag_name.py
@@ -0,0 +1,25 @@
+# Generated by Django 4.2.19 on 2025-04-03 19:36
+
+import agenda_culturel.models
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("agenda_culturel", "0162_siteconfiguration_site_url"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="tag",
+            name="name",
+            field=models.CharField(
+                help_text="Tag name",
+                max_length=512,
+                unique=True,
+                validators=[agenda_culturel.models.no_slash_validator],
+                verbose_name="Name",
+            ),
+        ),
+    ]
diff --git a/src/agenda_culturel/models.py b/src/agenda_culturel/models.py
index f1598cb..83c5265 100644
--- a/src/agenda_culturel/models.py
+++ b/src/agenda_culturel/models.py
@@ -49,6 +49,7 @@ from django.db.models.expressions import RawSQL
 from django.templatetags.static import static
 from django.conf import settings
 from solo.models import SingletonModel
+from django.core.exceptions import ValidationError
 
 from .calendar import CalendarDay
 from .import_tasks.extractor import Extractor
@@ -64,6 +65,11 @@ logger = logging.getLogger(__name__)
 to_be_translated = [_("mean"), _("median"), _("maximum"), _("minimum"), _("stdev")]
 
 
+def no_slash_validator(value):
+    if "/" in value:
+        raise ValidationError(_("The '/' character is not allowed."))
+
+
 class SiteConfiguration(SingletonModel):
     site_name = models.CharField(
         verbose_name=_("Site name"), max_length=255, default="Pommes de lune"
@@ -318,6 +324,7 @@ class Tag(models.Model):
         help_text=_("Tag name"),
         max_length=512,
         unique=True,
+        validators=[no_slash_validator],
     )
 
     description = CKEditor5Field(