More than two dozen arrests were made on the first night of the two-day Made in America music festival attended by 34,000 at Grand Park in downtown Los Angeles, police said.
At least 29 people landed in handcuffs Saturday - including a private security guard for the alleged battery of a concertgoer - the Los Angeles Police Department said. Officials said most arrests were drug and alcohol related.
The LAPD and Los Angeles County Sheriff's Department each had several hundred officers and deputies assigned to the festival and there were hundreds of private security personnel on hand as well, said LAPD Lt. Andrew Neiman said.
No major incidents were reported, although six people were taken to the hospital for heat-related ailments, authorities said.
The event was mostly peaceful.
"Here we're all united as one," said one concertgoer. "Music brings us together. We're here to have a good time, nothing else matters."
The concert features three stages and a lineup that includes Kanye West, Afrojack, Imagine Dragons, Kendrick Lamar, John Mayer and Iggy Azaela.
City News Service contributed to this report.