diff --git a/addons/event/models/event.py b/addons/event/models/event.py
index a40d29a46cd..03bc96d1d1a 100644
--- a/addons/event/models/event.py
+++ b/addons/event/models/event.py
@@ -118,7 +118,7 @@ class event_event(models.Model):
         'event.registration', 'event_id', string='Attendees',
         readonly=False, states={'done': [('readonly', True)]})
     # Date fields
-    date_tz = fields.Selection('_tz_get', string='Timezone', default=lambda self: self.env.user.tz)
+    date_tz = fields.Selection('_tz_get', string='Timezone', required=True, default=lambda self: self.env.user.tz)
     date_begin = fields.Datetime(
         string='Start Date', required=True,
         track_visibility='onchange', states={'done': [('readonly', True)]})
diff --git a/addons/event/tests/common.py b/addons/event/tests/common.py
index 1b59c662da6..55e5b2c0200 100644
--- a/addons/event/tests/common.py
+++ b/addons/event/tests/common.py
@@ -28,6 +28,7 @@ class TestEventCommon(common.TransactionCase):
             'login': 'Armande',
             'alias_name': 'armande',
             'email': 'armande.eventuser@example.com',
+            'tz': 'Europe/Brussels',
             'groups_id': [(6, 0, [self.group_employee_id, self.group_event_user_id])]
         })
         self.user_eventmanager = self.Users.with_context({'no_reset_password': True}).create({
@@ -35,5 +36,6 @@ class TestEventCommon(common.TransactionCase):
             'login': 'bastien',
             'alias_name': 'bastien',
             'email': 'bastien.eventmanager@example.com',
+            'tz': 'Europe/Brussels',
             'groups_id': [(6, 0, [self.group_employee_id, self.group_event_manager_id])]
         })