Oh, I realized I answered how we set it up, but maybe not what we do. It's just during regular library time, a parent volunteer presents/reviews a concept (the teachers tell us what they've been working on) and has an activity. Depending on the grade level, it might be playing with batteries, switches and bulbs, bringing in nature to look at under the microscope, building a motorized vehicle with LittleBits, or trying out pulleys.

Kids can also take stuff from the shelves to work on themselves, but we need to make activity cards to give the ones who are less sure of themselves a self-guided path.