diff --git a/apps/participation/migrations/0005_participation_valid.py b/apps/participation/migrations/0005_participation_valid.py
new file mode 100644
index 0000000..f22fc7d
--- /dev/null
+++ b/apps/participation/migrations/0005_participation_valid.py
@@ -0,0 +1,18 @@
+# Generated by Django 3.1.1 on 2020-10-11 13:58
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('participation', '0004_auto_20200927_1322'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='participation',
+            name='valid',
+            field=models.BooleanField(default=None, help_text='The video got the validation of the administrators.', null=True, verbose_name='valid'),
+        ),
+    ]
diff --git a/apps/participation/templates/participation/team_detail.html b/apps/participation/templates/participation/team_detail.html
index 018fcb2..a4570e4 100644
--- a/apps/participation/templates/participation/team_detail.html
+++ b/apps/participation/templates/participation/team_detail.html
@@ -1,6 +1,7 @@
 {% extends "base.html" %}
 
 {% load i18n %}
+{% load crispy_forms_filters %}
 
 {% block content %}
 
@@ -61,16 +62,42 @@
     </div>
     </div>
 
-    {% if team.participation.valid %}
-        <hr>
+    <hr>
 
+    {% if team.participation.valid %}
         <div class="text-center">
             <a class="btn btn-info" href="{% url "participation:participation_detail" pk=team.participation.pk %}">
                 <i class="fas fa-video"></i> {% trans "Access to team participation" %} <i class="fas fa-video"></i>
             </a>
         </div>
-    {% else %}
-        {# TODO Validate team #}
+    {% elif team.participation.valid is None %} {# Team did not ask for validation #}
+        {% if user.registration.participates %}
+            {% if can_validate %}
+                <div class="alert alert-info">
+                    {% trans "Your team has at least 3 members and all photo authorizations were given: the team can be validated." %}
+                    <div class="text-center">
+                        <button class="btn btn-success">{% trans "Submit my team to validation" %}</button>
+                    </div>
+                </div>
+            {% else %}
+                <div class="alert alert-warning">
+                    {% trans "Your team must be composed of 3 members and each member must upload its photo authorization." %}
+                </div>
+            {% endif %}
+        {% else %}
+            <div class="alert alert-warning">
+            {% trans "This team didn't ask for validation yet." %}
+            </div>
+        {% endif %}
+    {% else %}  {# Team is waiting for validation #}
+        {% if user.registration.participates %}
+            <div class="alert alert-warning">
+                {% trans "Your validation is pending." %}
+            </div>
+        {% else %}
+            Team asked for validation.
+            {# TODO Add validation form: validate or invalidate, with a message #}
+        {% endif %}
     {% endif %}
 
     {% trans "Update team" as modal_title %}
diff --git a/apps/participation/views.py b/apps/participation/views.py
index 22d72c4..6e8b9d0 100644
--- a/apps/participation/views.py
+++ b/apps/participation/views.py
@@ -90,12 +90,22 @@ class MyTeamDetailView(LoginRequiredMixin, RedirectView):
 class TeamDetailView(LoginRequiredMixin, DetailView):
     model = Team
 
-    def dispatch(self, request, *args, **kwargs):
+    def get(self, request, *args, **kwargs):
         user = request.user
         if user.registration.is_admin or user.registration.participates and user.registration.team.pk == kwargs["pk"]:
-            return super().dispatch(request, *args, **kwargs)
+            return super().get(request, *args, **kwargs)
         raise PermissionDenied
 
+    def get_context_data(self, **kwargs):
+        context = super().get_context_data(**kwargs)
+
+        team = self.object
+        context["can_validate"] = team.students.count() >= 3 and \
+            all(r.photo_authorization for r in team.students.all()) and \
+            team.participation.problem
+
+        return context
+
 
 class TeamUpdateView(LoginRequiredMixin, UpdateView):
     model = Team
@@ -148,7 +158,7 @@ class TeamAuthorizationsView(LoginRequiredMixin, DetailView):
                      _("Photo authorization of {student}.{ext}").format(student=str(student), ext=ext))
         zf.close()
         response = HttpResponse(content_type="application/zip")
-        response["Content-Disposition"] = "attachment; filename=\"{filename}\""\
+        response["Content-Disposition"] = "attachment; filename=\"{filename}\"" \
             .format(filename=_("Photo authorizations of team {trigram}.zip").format(trigram=team.trigram))
         response.write(output.getvalue())
         return response
@@ -172,7 +182,7 @@ class ParticipationDetailView(LoginRequiredMixin, DetailView):
         user = request.user
         if not self.get_object().valid:
             raise PermissionDenied(_("The team is not validated yet."))
-        if user.registration.is_admin or user.registration.participates\
+        if user.registration.is_admin or user.registration.participates \
                 and user.registration.team.participation.pk == kwargs["pk"]:
             return super().dispatch(request, *args, **kwargs)
         raise PermissionDenied
@@ -185,7 +195,7 @@ class UploadVideoView(LoginRequiredMixin, UpdateView):
 
     def dispatch(self, request, *args, **kwargs):
         user = request.user
-        if user.registration.is_admin or user.registration.participates\
+        if user.registration.is_admin or user.registration.participates \
                 and user.registration.team.participation.pk == self.get_object().participation.pk:
             return super().dispatch(request, *args, **kwargs)
         raise PermissionDenied
diff --git a/locale/fr/LC_MESSAGES/django.po b/locale/fr/LC_MESSAGES/django.po
index 44e0ee3..6876998 100644
--- a/locale/fr/LC_MESSAGES/django.po
+++ b/locale/fr/LC_MESSAGES/django.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: Corres2math\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2020-10-11 15:58+0200\n"
+"POT-Creation-Date: 2020-10-11 16:27+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: Yohann D'ANELLO <yohann.danello@animath.fr>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -223,9 +223,9 @@ msgid "Join"
 msgstr "Rejoindre"
 
 #: apps/participation/templates/participation/participation_detail.html:6
-#: apps/participation/templates/participation/team_detail.html:27
-#: apps/participation/templates/participation/team_detail.html:36
-#: apps/participation/templates/participation/team_detail.html:41
+#: apps/participation/templates/participation/team_detail.html:28
+#: apps/participation/templates/participation/team_detail.html:37
+#: apps/participation/templates/participation/team_detail.html:42
 #: apps/registration/templates/registration/user_detail.html:6
 #: apps/registration/templates/registration/user_detail.html:26
 msgid "any"
@@ -241,7 +241,7 @@ msgid "Team:"
 msgstr "Équipe :"
 
 #: apps/participation/templates/participation/participation_detail.html:16
-#: apps/participation/templates/participation/team_detail.html:40
+#: apps/participation/templates/participation/team_detail.html:41
 msgid "Chosen problem:"
 msgstr "Problème choisi :"
 
@@ -269,40 +269,40 @@ msgstr "La plateforme de cette vidéo n'est pas encore supportée."
 msgid "Upload video"
 msgstr "Envoyer la vidéo"
 
-#: apps/participation/templates/participation/team_detail.html:13
+#: apps/participation/templates/participation/team_detail.html:14
 msgid "Name:"
 msgstr "Nom :"
 
-#: apps/participation/templates/participation/team_detail.html:16
+#: apps/participation/templates/participation/team_detail.html:17
 msgid "Trigram:"
 msgstr "Trigramme :"
 
-#: apps/participation/templates/participation/team_detail.html:19
+#: apps/participation/templates/participation/team_detail.html:20
 msgid "Access code:"
 msgstr "Code d'accès :"
 
-#: apps/participation/templates/participation/team_detail.html:22
+#: apps/participation/templates/participation/team_detail.html:23
 msgid "Coachs:"
 msgstr "Encadrants :"
 
-#: apps/participation/templates/participation/team_detail.html:31
+#: apps/participation/templates/participation/team_detail.html:32
 msgid "Participants:"
 msgstr "Participants :"
 
-#: apps/participation/templates/participation/team_detail.html:44
+#: apps/participation/templates/participation/team_detail.html:45
 msgid "Grant Animath to publish our video:"
 msgstr "Autoriser Animath à publier notre vidéo :"
 
-#: apps/participation/templates/participation/team_detail.html:47
+#: apps/participation/templates/participation/team_detail.html:48
 msgid "Authorizations:"
 msgstr "Autorisations :"
 
-#: apps/participation/templates/participation/team_detail.html:53
+#: apps/participation/templates/participation/team_detail.html:54
 msgid "Not uploaded yet"
 msgstr "Pas encore envoyée"
 
-#: apps/participation/templates/participation/team_detail.html:60
-#: apps/participation/templates/participation/team_detail.html:73
+#: apps/participation/templates/participation/team_detail.html:61
+#: apps/participation/templates/participation/team_detail.html:104
 #: apps/participation/templates/participation/update_team.html:12
 #: apps/registration/templates/registration/update_user.html:12
 #: apps/registration/templates/registration/user_detail.html:64
@@ -310,11 +310,39 @@ msgstr "Pas encore envoyée"
 msgid "Update"
 msgstr "Modifier"
 
-#: apps/participation/templates/participation/team_detail.html:68
+#: apps/participation/templates/participation/team_detail.html:70
 msgid "Access to team participation"
 msgstr "Accéder à la participation de l'équipe"
 
-#: apps/participation/templates/participation/team_detail.html:72
+#: apps/participation/templates/participation/team_detail.html:77
+msgid ""
+"Your team has at least 3 members and all photo authorizations were given: "
+"the team can be validated."
+msgstr ""
+"Votre équipe contient au moins 3 personnes et toutes les autorisations de "
+"droit à l'image ont été données : l'équipe peut être validée."
+
+#: apps/participation/templates/participation/team_detail.html:79
+msgid "Submit my team to validation"
+msgstr "Soumettre mon équipe à validation"
+
+#: apps/participation/templates/participation/team_detail.html:84
+msgid ""
+"Your team must be composed of 3 members and each member must upload its "
+"photo authorization."
+msgstr ""
+"Votre équipe doit être composée de 3 membres et chaque membre doit envoyer "
+"son autorisation de droit à l'image."
+
+#: apps/participation/templates/participation/team_detail.html:89
+msgid "This team didn't ask for validation yet."
+msgstr "L'équipe n'a pas encore demandé à être validée."
+
+#: apps/participation/templates/participation/team_detail.html:95
+msgid "Your validation is pending."
+msgstr ""
+
+#: apps/participation/templates/participation/team_detail.html:103
 msgid "Update team"
 msgstr "Modifier l'équipe"
 
@@ -336,26 +364,25 @@ msgstr "Vous êtes déjà dans une équipe."
 msgid "Join team"
 msgstr "Rejoindre une équipe"
 
-#: apps/participation/views.py:86 apps/participation/views.py:164
+#: apps/participation/views.py:86 apps/participation/views.py:172
 msgid "You are not in a team."
 msgstr "Vous n'êtes pas dans une équipe."
 
-#: apps/participation/views.py:87 apps/participation/views.py:165
+#: apps/participation/views.py:87 apps/participation/views.py:173
 msgid "You don't participate, so you don't have any team."
 msgstr "Vous ne participez pas, vous n'avez donc pas d'équipe."
 
-#: apps/participation/views.py:148 apps/registration/views.py:213
+#: apps/participation/views.py:156 apps/registration/views.py:213
 #, python-brace-format
 msgid "Photo authorization of {student}.{ext}"
 msgstr "Autorisation de droit à l'image de {student}.{ext}"
 
-#: apps/participation/views.py:152
-#, fuzzy, python-brace-format
-#| msgid "Photo authorization of {student}.{ext}"
+#: apps/participation/views.py:160
+#, python-brace-format
 msgid "Photo authorizations of team {trigram}.zip"
-msgstr "Autorisation de droit à l'image de {student}.{ext}"
+msgstr "Autorisations de droit à l'image de l'équipe {trigram}.zip"
 
-#: apps/participation/views.py:174
+#: apps/participation/views.py:182
 msgid "The team is not validated yet."
 msgstr "L'équipe n'est pas encore validée."