CHP officers issued a call for backup from the Santa Barbara Police Department and the Santa Barbara Sheriff’s Office on Sunday night to help contain a brawl involving 100 people that started at a concert of La Banda MS held at the Earl Warren Showgrounds. A fight broke out during the concert, and efforts by the four private security guards to stop it reportedly served to escalate the mayhem. Four CHP cars arrived at the scene — the Showgrounds are a state-owned facility — but that proved insufficient. Santa Barbara police dispatched six to the scene, and the Sheriff’s Office sent some deputies, as well, quelling the disturbance. Authorities say one arrest was made for battery.