You could receive an invitation, but you won’t immediately know whether you want to accept or not. It could be fun or it could be boring. You can certainly delay making any sort of commitment to the person who invited you, but don’t make this person think that you’re not happy to be on guest list. Show your enthusiasm and assure them that you’re happy to be considered. Buy some time by telling them you have to check your calendar. Sleep on it and you’ll know how to answer soon.