NJ Plants (njnla.org) has a big trade show in Edison, NJ, on 1/24/12 and 1/25/12. I know because I'll be there at the Rutgers booth, talking about our landscaping classes, etc. I recently went to the Green Expo in Atlantic City. I don't care much for casinos (it was at Trump's Taj Mahal), but it was still pretty good. Lots of people there.