diff --git a/api/event/serializers.py b/api/event/serializers.py
index 741c01e..dce4c5b 100644
--- a/api/event/serializers.py
+++ b/api/event/serializers.py
@@ -4,7 +4,7 @@ from event.models import Event, ActivityTag, Place, ActivityTemplate
 
 
 # Classes utilitaires
-class EventSpecificSerializer(serializers.HyperlinkedModelSerializer):
+class EventSpecificSerializer(serializers.ModelSerializer):
     """
     Provide `update` and `create` methods  for nested view with an Event
     For example for Models which exetends EventSpecificMixin
@@ -48,7 +48,6 @@ class PlaceSerializer(EventSpecificSerializer):
         fields = ('url', 'id', 'name', 'description', 'event')
 
 
-
 # TODO rajouter des permissions
 class ActivityTagSerializer(EventSpecificSerializer):
     event = EventSerializer(allow_null=True, read_only=True)
@@ -59,29 +58,34 @@ class ActivityTagSerializer(EventSpecificSerializer):
 
 
 # TODO rajouter des permissions
-class ActivityTemplateSerializer(serializers.HyperlinkedModelSerializer):
-    event = serializers.ReadOnlyField(source='event.title')
+class ActivityTemplateSerializer(serializers.ModelSerializer):
+    event = EventSerializer(read_only=True)
     tags = ActivityTagSerializer(many=True)
 
     class Meta:
         model = ActivityTemplate
-        fields = ('url', 'id', 'title', 'event', 'is_public', 'has_perm',
+        fields = ('id', 'title', 'event', 'is_public', 'has_perm',
                   'min_perm', 'max_perm', 'description', 'remarks', 'tags',)
 
     def update(self, instance, validated_data):
         tags_data = validated_data.pop('tags')
+        validated_data.pop('event_pk')
+        event = instance.event
         [setattr(instance, key, value)
          for key, value in validated_data.items()]
         instance.save()
-        tags = [ActivityTag.objects.get_or_create(**tag_data)[0]
+        tags = [ActivityTag.objects.get_or_create(event=event, **tag_data)[0]
                 for tag_data in tags_data]
         instance.tags = tags
         return instance
 
     def create(self, validated_data):
         tags_data = validated_data.pop('tags')
-        activity_template = ActivityTemplate.objects.create(**validated_data)
-        tags = [ActivityTag.objects.get_or_create(**tag_data)[0]
+        event_pk = validated_data.pop('event_pk')
+        event = event_pk and get_object_or_404(Event, id=event_pk) or None
+        activity_template = ActivityTemplate.objects.create(event=event,
+                                                            **validated_data)
+        tags = [ActivityTag.objects.get_or_create(event=event, **tag_data)[0]
                 for tag_data in tags_data]
         activity_template.tags = tags
         return activity_template
diff --git a/api/event/views.py b/api/event/views.py
index b4a7ff4..4844e39 100644
--- a/api/event/views.py
+++ b/api/event/views.py
@@ -69,3 +69,7 @@ class ActivityTemplateViewSet(ModelViewSet):
     """
     queryset = ActivityTemplate.objects.all()
     serializer_class = ActivityTemplateSerializer
+
+    def perform_create(self, serializer):
+        event_pk = self.kwargs.get('event_pk')
+        serializer.save(event_pk=event_pk)
diff --git a/api/urls.py b/api/urls.py
index 60ae603..5065d7e 100644
--- a/api/urls.py
+++ b/api/urls.py
@@ -8,12 +8,13 @@ router = SimpleRouter()
 router.register(r'event', EventViewSet)
 router.register(r'place', PlaceViewSet)
 router.register(r'tag', ActivityTagViewSet)
-router.register(r'activitytemplate', ActivityTemplateViewSet)
 
 # Register nested router and register someviewsets vith it
 event_router = NestedSimpleRouter(router, r'event', lookup='event')
 event_router.register(r'place', PlaceViewSet, base_name='event-names')
 event_router.register(r'tag', ActivityTagViewSet, base_name='event-names')
+event_router.register(r'activitytemplate', ActivityTemplateViewSet,
+                      base_name='event-names')
 
 
 # The API URLs are now determined automatically by the router.