One big challenge at this event, and events like it, is the noise. I like to do patter, and patter gets destroyed by the background noise at a thing like this, unless you have a microphone, and I don't, yet. I plan to go that route eventually, but right now my act uses no electronics, and it's hard to resist that simplicity: I can show up at a place and open my trunk and get started, with no setup.
The older kids like my material just fine, but they show a much greater interest in trying things out. I spent a lot of time teaching half-juggling and plate spinning.