No sorry the date is set, perhaps you can call HBO and ask them to move their concert?
(Actually the other dates are full for us with the kids and their concerts and other events which is how we first settled on the 12th. Not to mention that my wife works nights and Wednesday nights are the only night she has off. And what good would prize giveaways be if the Prize Goddess wasnt there giving them away?!)
I just read this now 5 days later after thinking prizes would be given away during the party as in the past without pre-registration into the raffles.