Brittany L. James, 19, of Westport, was charged with breach of peace around 11:30 p.m. Friday after police said she punched someone at a concert at Sacred Heart University, 5151 Park Ave. The victim allegedly fell to the ground when James jumped on her and struck her several times in the face, police said.

A Fairfield officer witnessed the attack and two officers had to remove James from the event, police said.

James was released on a written promise to appear Sept. 16 in Bridgeport Superior Court.