The local public school has this fair annually and we like it. There were lots of electronic gadgets and wearables along with hovering photo drones and DIY Arduino computer kits, but I gravitate to the handmade things.
One friendly guy was selling carefully painted, bright enamel bicycle bells. He was good at making corrugated masks, too. Tubs of Lego for the kids, a TVO paints & crafts table and lots of school art projects on display.