Costume-Con 40 is local (Rockville, MD), going on in April, and my SCA barony was talking about having a table there. I’m just not sure yet if I can actually vendor at the event, though. I’d be selling books, not costume-related materials. On the other hand, it’s reasonable to assume that folks who do FSF costuming might be interested in FSF books. And, on the gripping hand: my money is as good as anybody else’s when it comes to a table fee, hey?
I guess we’ll see.