What form of mass entertainment took place here?

Chariot races
Dramatic theater
Gladiator battles
Political ortatory?

The form of mass entertainment that took place here is chariot races.

The form of mass entertainment that took place there included chariot races, gladiator battles, and dramatic theater. These were popular forms of entertainment in ancient Rome. Political oratory, although a form of communication and discourse, was not typically considered a mass entertainment event, as it involved speeches and discussions related to political matters.