There where some protesters at my convention this year. I'm fairly certain they weren't XJW, though. Saw them on saturday as the wife and I were leaving. On sunday I ended up walking to the car alone, and looked for them, but the either weren't there or had moved to another exit to try and maximize exposure. I really wish my wife hadn't been with me when I saw them, I would've given them a little schooling in how to be more effective in their protest.
Basically, their operation was 3 people, one holding a sign (I forget what it said, but it wasn't very impactful) another passing out leaflets, and a third reading from something that looked like a heavily annotated bible and making comentary. She read some scripture, and said that it was only by accepting christ that we could obtain salvation. Obviously, there's not a single JW that'd be swayed by any of this since they're making statements that either agree with JW doctrine or JWs think agree with their doctrine (ask a JW if jesus is their moderator, for example).
I really would've liked to tell them to just be silent and respectful, while holding signs with jwfacts.com on them and maybe a comment like "We love you" or something. I feel certain that'd work so much better since JWs are conditioned to not take flyers from appostates, but those with doubts might go to a web page once they're alone.