There’s so much you can do – I helped out at a hebrew school who made a mock seder and I got a ton of great ideas! I don’t remember everything. The leader had a contest where the kids had to build pyramids out of machine matzos, and we had to pretend to work them hard. For dam, she gave half of the kids pink shot glasses with water and a drop of red food coloring while the other half got blue shot glasses with clear water. The “mitzrim” had to pay the “ivrim” for some potable water. For tzfardea, she gave everyone plastic frogs and had the all get on the floor and do a fro-hopping contest. For arov she gave some kids toy animals and had them roar and chase after the “mitzrim”. She threw balls of “barad” while someone squirted a water gun all around. Turned off the lights for choshech and gave them glow stick bracelets while explaining the makkah. Can’t turn of lights at real seder, though. Maybe blindfold him. Great sound effects throughout. She really made them understand what hardships the Jews endured and how the plagues were so terrifying for our enemies. I was blown away by her inventiveness and enthusiasm. She said she found all the ideas online. Good luck for next year, and have fun!