diff --git a/communication/tests.py b/communication/tests.py
index 800eac6..0fce8fd 100644
--- a/communication/tests.py
+++ b/communication/tests.py
@@ -28,10 +28,8 @@ class SubscriptionTest(TestCase):
             created_by=cls.root,
             created_at=timezone.now(),
             description="Ceci est un test",
-            beginning_date=timezone.now()
-            + timedelta(days=30),
-            ending_date=timezone.now()
-            + timedelta(days=31),
+            beginning_date=timezone.now() + timedelta(days=30),
+            ending_date=timezone.now() + timedelta(days=31),
         )
         cls.groupsub = GroupSubscription.objects.create(
             content_object=cls.event,
@@ -55,4 +53,4 @@ class SubscriptionTest(TestCase):
 
     def test_all_subs(self):
         self.assertSetEqual(set(self.event.get_all_subscribers()),
-                         {self.user_true, self.user_group_true})
+                            {self.user_true, self.user_group_true})
diff --git a/event/signals.py b/event/signals.py
index f711f39..edac92b 100644
--- a/event/signals.py
+++ b/event/signals.py
@@ -12,7 +12,7 @@ def create_groups_for_event(sender, **kwargs):
     event, created = kwargs["instance"], kwargs["created"]
     if created:
         orgas = EventGroup.objects.create(
-            name="orga",
+            name="{}_orgas".format(event.slug),
             event=event
         )
 
@@ -22,7 +22,7 @@ def create_groups_for_event(sender, **kwargs):
             assign_perm(perm.codename, orgas, event)
 
         EventGroup.objects.create(
-            name="participants",
+            name="{}_participants".format(event.slug),
             event=event,
         )
 
diff --git a/event/tests.py b/event/tests.py
index 29c840f..cac64c8 100644
--- a/event/tests.py
+++ b/event/tests.py
@@ -1,10 +1,13 @@
 from django.contrib.auth import get_user_model
+from django.contrib.contenttypes.models import ContentType
+from django.contrib.auth.models import Permission
 from django.core.exceptions import ValidationError
 from django.test import TestCase
 from datetime import timedelta
 from django.utils import timezone
-from .models import Event, ActivityTemplate, Activity, Place, \
+from .models import Event, EventGroup, ActivityTemplate, Activity, Place, \
     ActivityTag
+from guardian.shortcuts import assign_perm
 
 User = get_user_model()
 
@@ -24,10 +27,8 @@ class ActivityInheritanceTest(TestCase):
                         created_by=cls.erkan,
                         created_at=timezone.now(),
                         description="La nuit c'est lol",
-                        beginning_date=timezone.now()
-                        + timedelta(days=30),
-                        ending_date=timezone.now()
-                        + timedelta(days=31),
+                        beginning_date=timezone.now() + timedelta(days=30),
+                        ending_date=timezone.now() + timedelta(days=31),
                     )
         cls.loge = Place.objects.create(name="Loge 45")
         cls.aqua = Place.objects.create(name="Aquarium")
@@ -47,8 +48,7 @@ class ActivityInheritanceTest(TestCase):
         self.real_act = Activity.objects.create(
                         parent=self.template_act,
                         event=self.event,
-                        beginning=timezone.now()
-                        + timedelta(days=30),
+                        beginning=timezone.now() + timedelta(days=30),
                         end=timezone.now()
                         + timedelta(days=30)
                         + timedelta(hours=2),
@@ -155,3 +155,50 @@ class ActivityTagColorTest(TestCase):
                     )
         with self.assertRaises(ValidationError):
             self.tag.full_clean()
+
+
+class EventPermissionTest(TestCase):
+    @classmethod
+    def setUpTestData(cls):
+        cls.user_perm = User.objects.create(username="userperm")
+        cls.user_noperm = User.objects.create(username="usernoperm")
+        cls.user_groupperm = User.objects.create(username="usergroupperm")
+        cls.user_groupnoperm = User.objects.create(username="usergroupnoperm")
+        cls.root = User.objects.create_superuser(
+            username="root",
+            email="toto@toto.io",
+            password="toto"
+        )
+        cls.event = Event.objects.create(
+            title="Hackathon",
+            slug="django",
+            created_by=cls.root,
+            description="Le code c'est cool",
+            beginning_date=timezone.now(),
+            ending_date=timezone.now() + timedelta(days=1),
+        )
+
+    def test_event_groups(self):
+        groups = EventGroup.objects.filter(
+            event=self.event
+        )
+        self.assertEqual(groups.count(), 2)
+
+    def test_individual_perms(self):
+        assign_perm("event_add_place", self.user_perm, self.event)
+        self.assertTrue(self.user_perm.has_perm("event_add_place", self.event))
+        self.assertFalse(self.user_noperm.has_perm("event_add_place",
+                                                   self.event))
+
+    def test_group_perms(self):
+        orgas = EventGroup.objects.get(
+            name="{}_orgas".format(self.event.slug),
+        )
+        self.user_groupperm.groups.add(orgas)
+        for perm in Permission.objects.filter(
+                content_type=ContentType.objects.get_for_model(Event),
+                codename__contains="event_"):
+            self.assertTrue(self.user_groupperm.has_perm(perm.codename,
+                                                         self.event))
+            self.assertFalse(self.user_groupnoperm.has_perm(perm.codename,
+                                                            self.event))