You can RSVP and UNRSVP to regular events whenever you like while the event is still open.
PREMIUM EVENTS + MOVIES:
If you RSVP to a movie or Premium event and then decide you don’t want to go anymore you, unfortunately, will not be able to get the Pass refunded back into your giggedIn account.
Once you receive a movie pass it is yours and can not be refunded or exchanged. Movie passes are generally valid for about a month after claiming so you don’t need to use it straight away you can plan out your next movie date!