We sent out most of our invitations around the last week of May and the first week of June. We came to found out through casual conversation that a couple never made it to their destination, so we were able to resend. Now our RSVP date has passed and we're following up on those who haven't replied. Turns out a couple of people never even knew they were invited! And now I feel bad because we're giving them such short notice. Should we have confirmed that each individual invitation was received? We don't talk to everyone often enough to have found out casually.