Police had a field a day at a three-day rave in San Bernardino County over the holiday weekend.

The San Bernardino County Sheriff's Department says 428 people were arrested between Friday and Sunday at or near Nocturnal Wonderland. The interesting part is that deputies were invited to the party. In some cases, the promoter, Insomniac Events, paid for them to be nearby.

“Additional law enforcement officers, paid by Insomniac, were assigned to patrol the Devore and Rosena Ranch area,” the department said in a statement.

The good news is that no deaths were reported for a scene that has been shaken by drug overdoses in Southern California and in Las Vegas. Three fans died after they attended Hard Summer near Fontana last month. Those cases have not been tied to drugs and were still under investigation, but the tragedies prompted a San Bernardino County supervisor to propose another look at banning events at the San Manuel Amphitheater near Devore.

The ban didn't happen, and Nocturnal Wonderland, driven by electronic dance music, went on as planned. It was, according to Insomniac, the “21st anniversary of North America’s longest-running dance music festival.”

“As the sun set each night, Insomniac transformed the scenic San Manuel Amphitheater & Grounds into a vibrant world of imaginative sights and sounds,” Insomniac stated.

Authorities said 67,195 came through the turnstiles over three days. It's not clear how many of those were repeat or three-day ticketholders, but the biggest attendance day was Saturday, which saw attendance of 25,762, sheriff's officials said.

The arrests were based on suspicion of drug possession, being under the influence of drugs or alcohol, assault, resisting arrest, trespassing, being younger than 18, and indecent exposure, they said.

Six people were hospitalized, including a cop who sustained minor injuries for reasons not disclosed, deputies said. “One attendee was arrested for DUI after crashing into a marked motor unit working the event,” the San Bernardino department stated. “The deputy was not injured.”

Noise complaints, which inspired the original movement to ban raves at the amphitheater, were unfounded, cops said. In each case, sound measurements were taken and noise was found to be within “acceptable limits,” the department stated.

Headlining acts included Chromeo, 3LAU, Audien and more.

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