The ball game
The ball game was a very important activity for many of the ancient American civilisations in which they would sometimes choose victims for sacrifices.
I thought it would be a nice idea to incorporate it in my world as a way of maybe choosing warriors to go for mythical creature hunts or wars with subject cities or enemies.
It consisted of having a heavy rubber ball, two teams and two walls with a ring high above through which they should make the ball pass to score. They could only use their hips to hit the ball and they would also need to gain territory and push the other team farther in the courtyard.