NYC Javits: PhotoPlus 2010
As Rdefen noted, you typically see a lot of folks with their personal cameras (still & video).
If you haven't already planned on it, you might want to take a number of your own images on a media card. Often you can get vendors to make prints for you to show off their printers. We were looking closely at dye sub printers last year and were able to make a number of prints to compare that way.
I haven't gone in 15 or so years but I'm planning to go this year. It's been so long I don't remember much about the exibit rules. So, should I bring a camera bag, just a minimal camera setup, or nothing? I plan to try out some lenses and look at some printers.