The Newton Free Library will hold its 4th annual STEAM Expo for all ages on Saturday, July 15, 12-3PM.  Last year, over 1,500 attended, and this year’s Expo is expected to be even bigger. This STEM + Arts Expo is a gathering of tech enthusiasts, traditional crafters, artists, musicians, educators, tinkerers, hobbyists, museums, engineers, and students. This year’s Expo includes a giant inflatable planetarium, LED light-up necklaces, an augmented-reality sandbox, and much, much more.