Is this best handled by resending the invite first thing tomorrow AND following up with a phone call to explain what happened?
It only has to go from Denver to Aspen so it shouldn't take more than a day to get there. I'm hoping the couple is still on vacation and won't even know what happened. But it still sucks it's this close to the RSVP date, but I guess as the saying goes to each life a little rain must fall.
I guess this isn't as bad as my Mom texting me on July 4th with: I hope you're not mad, I (verbally) invited so-and-so.......!