First, I called Travel by Horizon, the vendor who sponsored the prize. Initially, their rep assured me that they would be able to extend the expiration date, but I would need to wait for a confirmation. So I waited. And I waited. I made several unanswered calls to their office. I was now being completely ignored. (A call back explaining the situation would have been nice. Seriously, if that's how they treat a customer inquirey, I would never consider booking a trip with them!) So I called the company who issued the certificate, but I was finally told there was nothing they could do for me. We would have to travel by the expiration date.
Moving our wedding date to fit in our honeymoon was not an option since we had already put down our non-refundable deposits for both venues. We simply would not be using the certificate for our honeymoon (I decided to give the prize to my sister, lucky girl!) So there we go, we won a free honeymoon, and then we lost it. Major bummer.