High school students are the target
I used to do a traveling Physics demonstration show in college for high-school students that sounds like it had the same goal as yours. My main recommendation is that make sure whatever you show them you make them say "Wow!" early, and then keep them saying "Wow!" until you're done. For engineering, everyone likes robots, so if it were me that's what I would focus the presentations on. I also would make sure there was audience participation, but would not do a workshop, as those are very hard to facilitate.
Thank you for the advice Neil
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