I don't need to send RSVPs for quite some time, but I am planning a destination wedding so I sent my save the date cards out already. A few people have already said they can't come (one even sent us a card in writing saying they couldn't come). It feels odd to send a RSVP to guests who have said they can't come, but I know you are supposed to send a RSVP to everyone who gets a save the date. Thoughts?