This year, from 11 July to 22 August (6pm Wednesdays and Fridays), they have Camargue Bull Races. Described as: "... a
sport in which participants attempt to catch prize-winning attributes attached to the forehead and horns. There's no kill involved in this sporting game.
Agility, speed and thrills: guaranteed spectacle!"
On a couple of (other) days of the week they have the gladiator "school" that you saw, and staged demonstrations.
The town goes all out 18-23 August this year for the annual
Arelate Festival - Roman Days.