I think the "fun" comes from the energy of the crowds of people, most are there to have a good time, learn something new, and it doesn't hurt to come home with bags of free goodies!
Recently we attended the Oklahoma City Chamber of Commerce event, SchmoozaPalooza.
Our VP of Sales, Curtis, (pictured below on the left) brought a air gun with him to the event. It puffs a blast of air across the room and it's hysterical to watch people who get "puffed" because they don't know what happened to them, or where the puff of air came from! It's great fun!