Things happen. It's possible that you could still do something awesome for the prize winners. Even if it isn't blends, maybe there's something else you can do for the good people. I know that if I had won your prizes and I heard this from you, I would have just said "Hey. It's cool. I've had stuff like this happen to me, too. If you have any other ideas for something you could do for me, even if it isn't blend-related, I'm sure I'd think that would be awesome, too!"
I hope that things work out for you soon!