Years ago there was an engineering summer camp thing with @whyameye and @TomM where students built a giant Rube Goldberg machine. The students worked in groups to build modules that did whatever they wanted it to do, so long as it could be activated by a ping pong ball dropping into a cup and finished by dropping a ping pong ball to the next module. Knowing they’d probably be working until the very last second, having a universal input/output (theoretically) meant the modules could be put in any order and there would be little need for integration testing… theoretically. Many of them had bigger ambitions than they had time or supplies, and honestly the big reveal was about as smooth as you’re probably imagining… BUT it was so much fun to see them brainstorming and building, and the little hiccups kind of made the whole even more endearing.
So anyway, we could have each area build one or more components to a Rube Goldberg machine that ends with a ribbon being cut.
Edit: bonus points if it also starts with a ribbon being cut.