_default_tickets was removed in odoo11
_default_tickets was removed in odoo11

In Odoo, it is now the role of the event.type to handle the default tickets. But we have a wizard that create directly an event.event and edit the tickets
eicher31/compassion-switzerland,CompassionCH/compassion-switzerland,CompassionCH/compassion-switzerland,eicher31/compassion-switzerland,eicher31/compassion-switzerland,CompassionCH/compassion-switzerland