rsvp date is approaching and there are still guests who don't have their invitations!

I wrote down the rsvp date 2 months before the wedding to give us enough time for seating charts since I'm planning a destination wedding and there's a lot of moving parts. I didn't think my invitations would take so long to prepare since every one of them were hand crafted by me. Now we are almost at the rsvp deadline and there are still guests who don't have their invitations yet. I'm not sure how to give them the details card without them being offended. It's not last minute because we still have 2 months and everyone had a year to prepare since the save the date card was sent out. Help!

P.s. please keep in mind that the invitations were going to 6 different countries and 2 continents.