no way to hide the button in a clean way. but if you disable registration for all the tickets you have (for instance setting start/end registration dates in the past) yhen magically the button disappear.

Hi,

I think there is no direct field available in Odoo for enable and disable the event registraion. But there is a way you can restrict the user from register to a event by setting the Limit Registation checked and set the Attendees to 0 in the desired event form page. By doing this the users are not allowed to register for that particular event.

Hope this will help you.

Thanks.