PAX East is coming up soon (April 6th-8th, Boston, MA), and while getting passes is difficult for the average plebian, there's still a little section...
Interested in exhibiting at PAX East 2012? Contact Bill Butler (email@example.com) for info on booth space and sponsorships.
Really late to be bringing this up, but there's always the next PAX in probably ~6 months' time. The last time I mentioned it, it was well-received but I don't think anything came out of it.