AIvory
Teams run a jewellery business for an afternoon — plan a budget, buy materials, book a stall, make the pieces and sell them to real customers walking the floor. Every team has AIvory beside them: an AI teammate that knows their balance, their stock and the rules, and argues its corner when they ask.
The money is real inside the room. Overspend on a prime stall and you cannot afford the beads. Make more than you sell and the leftovers come back at forty per cent. Nobody has to be told the lesson afterwards — they watched it happen on the board.