odoo/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
2	access_event	event	event.model_event_event	portal.group_portal_user	1	0	0	0
3	access_registration	registration	event.model_event_registration	portal.group_portal_user	1	0	0	0