I don’t really like capture-go as a stepping stone to teach people real go, but if this is just a one-time thing and the goal is not to teach them real go, capture-go may give this event a bit more depth than a ladder workshop.
Double atari, ladders and nets would then be game winning tactics.
Some capture-go puzzles can even be found in the forums: Capture go problems ⚫
You could also opt to increase the difficulty by requiring capturing more and more stones to meet a win condition. This would enable sacrifice tactics, such as snap-backs and nakade.