diff --git a/calebasse/agenda/models.py b/calebasse/agenda/models.py
index 974c68b..f72ba00 100644
--- a/calebasse/agenda/models.py
+++ b/calebasse/agenda/models.py
@@ -547,7 +547,7 @@ class EventWithAct(Event):
             '{act_type} ({act_type.id})'.format(**kwargs)
 
 
-from django.db.models.signals import m2m_changed
+from django.db.models.signals import m2m_changed, post_save
 from django.dispatch import receiver
 
 
@@ -557,3 +557,8 @@ def participants_changed(sender, instance, action, **kwargs):
         workers = [ p.worker for p in instance.participants.prefetch_related('worker') ]
         for act in instance.act_set.all():
             act.doctors = workers
+
+@receiver(post_save, sender = EventWithAct)
+def create_act(sender, instance, **kwargs):
+    instance.act.parent_event_id = instance.id
+    instance.act.save()