This car gathering and swap meet is on private land. And it’s not regularly used for stuff like this (no microscope over it) And it’s in San Bernardino county. 3 huge pluses.
Just be careful calling it an “event”, cause some “Karen” will complain it’s like a concert or Dodger game.
I know a couple people bringing a large amount of parts to sell. Ns1rm21, here is bringing 20-25 huge stuffed totes of mopar parts on his truck and trailer.