Dragon*Con?

I don't think I can afford a full weekend of con, but I do think I can pull off a day trip to D*C. It's close enough to comfortably do in a day, and the sheer amount of awesome showing up there will have me running around squeeing like the worst of the otaku fangirls. Patrick Stewart, Leonard Nimoy, Adam Savage (potentially the other Mythbusters, too), Peter Mayhew, etc.

Who else has plans of showing up there?