Do a mnemonic phrase puzzle. It can be an easter egg hunt or an ARG. Way more fun.

Also, maybe show off some cool stuff you can do with Bitcoin like multi-sig and timelocks.

If you can teach Bitcoin script it can become more of a programming club. https://bitcoin.sipa.be/miniscript/

You can go over PRs, you can read various books on economics, but they will be much less interested in that.

You can also try taking inspiration from El Zonte's Hope House: https://hopehouseelsalvador.org/en/