diff --git a/event/migrations/0003_auto_20170726_1116.py b/event/migrations/0003_auto_20170726_1116.py
new file mode 100644
index 0000000..e776702
--- /dev/null
+++ b/event/migrations/0003_auto_20170726_1116.py
@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.11.3 on 2017-07-26 11:16
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('event', '0002_auto_20170723_1419'),
+    ]
+
+    operations = [
+        migrations.RenameField(
+            model_name='event',
+            old_name='creation_date',
+            new_name='created_at',
+        ),
+        migrations.AlterField(
+            model_name='activity',
+            name='parent',
+            field=models.ForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='children', to='event.ActivityTemplate'),
+        ),
+    ]
diff --git a/event/models.py b/event/models.py
index 957e13a..eebe9b3 100644
--- a/event/models.py
+++ b/event/models.py
@@ -24,7 +24,7 @@ class Event(SubscriptionMixin, models.Model):
                     related_name="created_events",
                     editable=False,
                 )
-    creation_date = models.DateTimeField(
+    created_at = models.DateTimeField(
                     _('date de création'),
                     auto_now_add=True,
                 )
@@ -179,7 +179,8 @@ class Activity(AbstractActivityTemplate):
     end = models.DateTimeField(_("heure de fin"))
 
     def get_herited(self, attrname):
-        inherited_fields = [f.name for f in ActivityTemplate._meta.get_fields()]
+        inherited_fields = [f.name for f in
+                            ActivityTemplate._meta.get_fields()]
         m2m_fields = [f.name for f in ActivityTemplate._meta.get_fields()
                       if f.many_to_many]
         attr = getattr(self, attrname)