I think its like a convention for people that like aquariums. I only found out about it because I happen to glance at an advertisement in a copy of Aquarium USA (that I picked up on a whim).
Its not that far from me either and it only costs $10, so I dont think I can be disappointed.
Im hoping there may be some discounted aquarium supplies there, tbh. Im in the planning stages of a new 90, so saving some cash on stuff would be sweet. Even if that isnt going to be the case, there should be some neat stuff to look at. Kid's Aquarium Contest!? That already sounds like its worth the price of admission.