Noreascon (http://www.noreascon.org/) is Sept 2-6th in Boston, MA.
I just wanted to share that a contact of mine (ranma1224@yahoo.com) is running the game room. Apparently, you don't have to pay for a table to show off your wares, IF you just want a table in the game-room itself. (I think a Dealer's Row or such still costs money.)
Best of luck,
dev