Sophia.org, a website that is a resource for teachers and offers resources for flipping the classroom. Bill has created some videos for them, it's really not surprising that he'd team up with such a group as science education and awareness is a focus of his.
They did demonstrations of various scientific concepts like the power of air and momentum. I have to admit, that I was partial to them using a giant air cannon made out of a trash can to blow out a candle. Making one of these air cannons maybe the summer project around our house. The used a bicycle wheel to show how spinning objects don't fall, and Bill sat on a spinning office chair and let the wheel move the chair. There was a game of tug-o-war, where the two sides were pulling against a vacuum of air less than an inch thick. I think the crowd favorite was watching Bill Nye apply a sledgehammer to a cinder block that was lying atop a man's chest while he laid on a bed of nails.
It was a great experience, even though I didn't actually get to officially meet Bill. It was a crowd full of my tribe: the geeks, nerds, dorks. There were people dressed up in superhero costumes and handmade Viking helmets. Most everyone was very nice and considerate despite the crowded conditions. Maybe I was just having a fan-girl high. Even stores on the other side of the mall got into the spirit of the event.