My fiance and I both come from very big families. We are sending out save the dates, but have both an "A" list and a " B" list. We are only sending out save the dates to our "A" list. Is it rude or inappropriate to put another card with save the dates and ask the couple if they know they will be able to make it to please let us know? How would you word that? Since people don't RSVP on time might this help so we can send our "B" list invitations before it is to late??? Please help..