Different spike tape might be interesting to bring, and maybe glow tape! They may enjoy seeing you use glow tape and being able to charge it themselves/watching you do it.
Also, you could compare onstage/theatre to movies at the start to explain to them what it means, like "you know everything you see in a movie, all the sets and props and effects, I do that but live and in real time." If there are any kids who don't know much about theatre, it might relate to them and then after that just explain what you do specifically.
If you could maybe bring in a video of you calling a show, they may find that interesting. Also, to explain calling a show, you could use the game Red light/Green light, if they've played it (I know I did as a kid, so they might have). Red light is standby, Green light is go, but instead of running, they make the lights go and the sounds play and the sets move. If you're able, you could even play it with them!
Hope it helps!