Under the RSVP section when creating a new event is the option to add user to X group on subscribe. Is there any way to allow multiple groups to be selected?

For example. I have a base membership group called members and then i have groups created for mailings and other event-specific things. I would like people who sign up for an event to be added to both the members group (if not already there) and also to the event specific group.

Please advise, and thanks again 🙂