I just watched the movie lowriders
http://justacarguy.blogspot.com/2017/04/movie-about-lowriders-and-skate-punk.html and learned about Elysian Park, a public park in central LA
Since the late 50's, or maybe even farther back in history, lowriders, just like hot rodders, were targeted by LAPD most everywhere they were, for moving violations and other mickey mouse shit. They finally figured out a way to avoid the cops though.
The lowriders did something really clever, that cops could not do shit about, unlike every weekend at a get together in some parking lot where cops would swoop in ticket every stupid thing and impound cars.
The park’s central location to car clubs in Los Angeles, the Valley and Orange County and relatively low permit fees have also made it a popular site for car club picnics. These are technically not shows, which apparently are not permitted. But what’s the point of a car club picnic if no one brings their Impala to show off?
The lowriders got a picnic permit and drove their cars in, had a contest, and then it became a annual event. Cops couldn't give them shit, they were having a picnic, with a city permit.
But, things do get out of control a bit, and the nearby Echo Park residents complained, called in the city council, the police and parking officers to enforce noise, traffic and drinking-in-public laws.
https://www.theeastsiderla.com/2009/05/it-may-take-more-than-cops-and-tickets-to-keep-lowrider-shows-out-of-elysian-park/