I've never heard of it. It's might be a fun convention if you are into what they have and it looks like it happens at the same time Hershey Park opens for the season. The list of guest "stars" (as the ad refers to them) is quite, um, interesting.
Bronson Pinchot and some girl who was in "I Dismember Mama"?
It almost looks like a spoof, some type of SNL skit.