Eleven people have been charged following a fracas at last year's Epsom Derby.
Surrey Police said bottles were thrown in the disturbance at the Epsom Downs Racecourse on 4 June.
The all-male group, charged in connection with disorder near a music stage, is due in court over the next four weeks.
During the violence a police officer's tooth was knocked out. He had to be treated in hospital for his injuries.
Those charged are aged between 16 and 20.
About 100,000 race-goers attended the two-day festival.