What sport will be invented next?

Political horseshoes. Don't matter if you make a ringer as long as you can claim you did.
Or maybe twitterball, as long as Elon says you won,you won.Or maybe uphill skiing , competitive farting or dialectical trivialism. Aye the possibilities are endless and that's not even considering real life zero gee quidditch.

Zero g or just lower g is a new realm of possibilities. In a swimming pool on the Moon you probably could jump high out of the water like a dolphin.