When I got my packet for Gen Con, they spelled my name Byron...when in fact its Bryan...and on the invite list it says Byron as well...will this be a problem? Should I try to call upperdeck, or since Gen Con is tomorrow, would it be too late??

You're screwed! You'll never get in now!

It shouldn't be an issue actually. Spelling mistakes are pretty common. I would make sure to take my player packet though.