Instead of a formal rehearsal dinner we are having everyone get together and do an escape game where you get locked in a room for an hour and have to solve clues to get out. Afterwards everyone will go to the house and it will be a small party with games. It will sort of be like a bridal shower but for both couples and the night before the wedding. We don't want to call it a shower because that sounds like we are expecting gifts. How should we call this evening on the invitations?