Question

find the appositive. if it is nonrestrictive, set it off with commas. if it is restrictive, submit the text without making any changes.
the circus maximus a former site of roman chariot races and gladiator fights still draws crowds for public events.

Explanation:

The phrase "a former site of Roman chariot races and gladiator fights" is a nonrestrictive appositive. It provides extra, non-essential information about The Circus Maximus (a specific, unique landmark), so it needs to be set off with commas.

Answer:

The Circus Maximus, a former site of Roman chariot races and gladiator fights, still draws crowds for public events.