A meetup sounds like a rad idea. I'll be attending PAX, and I should be available Thursday night after my plane gets in and whatnot. I'm cool with whatever, but I don't know Boston so I'm afraid I can't be of much help in terms of suggestions.
Lurker signing in. I live in Boston, and am going to PAX. Meeting at the Sheraton the night before sounds like a good plan. If no one else wants to run anything, I could run some D&D or C&C (C&C preferably because it's simpler- less of a "need" for minis). I've been meaning to run the Dark Chateau (part of the Castle Zagyg line).
I thought we would be able to meet up, but unfortunately we are just too wiped by the work week to make it over there and we want to be rested before the festivities begin. So we are going to stay home tonight.
Maybe we will catch up with some of you during the weekend!