I was wondering if it would be rude if on the save the date you have a pre RSVP especially for the out of town guests? We are on a tight budget and need to cut the guest list however, my FI wants to invite family members who he for sure knows will not come. I feel like this is a waste of invite however he can not invite one cousin from a family he has to invite them all. So if we were to send a save the date with an RSVP type of thing to see who for sure can not come so we can either substitute other people in or just have a smaller guest list.