diff --git a/models/event.py b/models/event.py
index 44e362d..19c783a 100644
--- a/models/event.py
+++ b/models/event.py
@@ -13,7 +13,7 @@ class Event(models.Model):
     _order = 'id desc'
 
     name = fields.Char('Title', required=True)
-    manager_id = fields.Many2one('coworking.coworker', 'Manager', index=True,
+    manager_id = fields.Many2one('coworking.coworker', 'Manager', index=True, required=True,
                                  domain="[('coworker_type', 'in', ['staffer', 'member'])]")
     date_start = fields.Datetime(default=fields.Date.context_today, required=True)
     starts_this_week = fields.Integer(compute='_compute_starts_this_week',