Funny you should ask now,
Funny you should ask now, because we are doing a 2nd exhibit at the same museum on April 21st this year!
The 1st exhibit went pretty well. We built this SpurtBot line follower design. I brought enough for 20 kits, and every single one got built.
We also had displays about batteries, including potato battery experiments. We had Squishy Circuits, which are really fun. I built a power generation station, where kids could turn cranks and run various electrical devices. We had robot toys running all over the place, plus building sets like ‘Gears, Gears, Gears’, etc.
This year I’m revising the SpurtBot design to make a SpurtBot ShadowBot. It will run forward until it hits a shadow, then it will back up and turn for a moment and then continue forward. Kids can chase them and try to put the sensor in shadow with their hands. It’s lots of fun. This design will be a no-solder build for the kids, which should be a lot easier than last year. The age range for the exhibit is 6-12 years old.