Using the account of a day at the games on the page about Roman gladiators, how about putting together a play showing the events of the day? Here's a list of possible characters:
The wealthy sponsor
The slave gladiators
The wild animals
The criminals to be executed (some of them Christian?)
The Roman guards
Don't forget: in the morning, it's gladiators fighting animals, then at lunchtime the condemned criminals are executed, and after lunch it's gladiators fighting other men.