I've got two of the "2012 Spring MegaBonus Free Night Certificate, Category 1-4 Hotel" that I had planned to use for a buddy's wedding, but of course there's a convention going on that weekend and no reward rooms are available. Obviously I'm not losing out on anything major if I can't find another weekend to make use of them before 9/30/12 when they expire, but are there really any other options out there available for these free night certs? Do they ever extend them? Can you get around the expiration by booking future travel beyond the exp date (as long as you book before)? Any websites that trade or exchange them? Thanks.