I haven’t been able to figure out the exact hours when the balloon guy is in, but almost all weekends and Friday evenings he seems to be at Ruby’s Diner. My kids totally adore him, and they love trying to out do eachother with the requests. In my video below he is making an Ariel mermaid. For boys there are fishing poles and swords.
He just comes up to the table to see if you want anything for your kids. It doesn’t cost anything, but the idea is to tip him. We give him a few bucks and the kids are very entertained. The trick is trying to keep them from popping the balloons within five minutes.