Here’s a suggestion: A Michigan Mighty Mite class.
One of my favorite DMS people, who has since passed, was Walter Anderson. A somewhat controversial figure who was a genius at many things and whom I called a friend. He taught a successful Michigan Mighty Mite class documented here:
6+ years ago and it was very well received. I had fun in the class and learned a lot, too.
You can find plans for the Michigan Mighty Mite online, too. Here’s an example:
https://www.qsl.net/wb5ude/kc6wdk/transmitter.html
Raspberry Pi, Robotics, Arduino, Home Automation and Basic General Electronics all have interest.
I’ve also thought from time to time an electrician’s basic class would be interesting, too. How to wire your porch light with a three way switch for instance. Another big topic is off the grid systems or power backup systems. I’d take a solar energy class, too.
Just some ideas.