I am no expert, and a new beardie owner. I do plan to go to repticon when it comes close to me, and I have thought about taking one of mine. Here is my conclusion: Beardies like to lick everything. Lots of folks seem to not know when their beardie is sick, until they are really sick. You don't know how the folks there are going to keep their vivs. It is also going to put some limits on what you can do ie: hold other reptiles, go to eat, that kind of thing. Also beardies, from what I have seen are not social with other beardies, or any other animal, from what I have seen, and you would not want yours to get in a fight. Now if you are willing to keep your beardie on you, or have a partner than you can trade off with, and take some germex wipes or a small pocket size bottle, and your beardie does not mind a lot of commotion, then go for it. You can keep your beardie safe enough to go, it will just take a lot of careful watching.
Good Luck