Showing how a volcano works and erupts is an experiment demonstration that attracts a younger audience in particular.
Target group: Broad, flexible. Appeals to the young.
Preparations: Find someone who can arrange the show, obtain a “volcano” and necessary chemicals, decide on a venue and time, market the show. Permits may be required from the police and fire department
Challenges: Finding a good place outdoors and someone who can conduct the experiment.
Benefits: Appeals to a younger audience.