The bust from the San Joaquin County Sideshow Task Force happened on Saturday evening at the Grocery Outlet parking lot on Yosemite Avenue.
Manteca police said they did more than 60 traffic stops, issued more than 35 citations, towed five vehicles, and arrested three people during the event.
Police said two people were arrested for reckless driving, and a third person, identified as Chayse Lee, 23 of Lathrop, was arrested on charges including unlawful possession of a loaded firearm.
Manteca police said they arrested Lee on Flores Avenue after he left the event and found a loaded Glock on him. He was taken into custody without incident.