addons/portal_event/security/ir.model.access.csv

   1 id,name,model_id:id,group_id:id,perm_read,perm_write,perm_create,perm_unlink\r
   2 access_event,event,event.model_event_event,portal.group_portal,1,0,0,0\r
   3 access_registration,registration,event.model_event_registration,portal.group_portal,1,1,1,1\r
   4 access_event,event,event.model_event_event,portal.group_anonymous,1,0,0,0\r
   5 access_registration,registration,event.model_event_registration,portal.group_anonymous,1,1,1,1\r