While it’s not socal, there are a bunch of events!
There is one org in SF at puts them on on the regular: https://bclmeets.com/
they often do them at ocean beach, sometimes half moon bay.
My fav thing right now is https://www.breakfastclubrally.com
I went to one today and they are so fun. Get there early and It’s sort of a cars & coffee with super curated cars, then you all go for a drive. They have a Japanese car only event on sept 24 (Tokyo calling) that will apparently have 10+ nsxs (me included). Tokyo calling will likely will be in and around Marin county.
If you are willing to come to the north bay, the Marin / Novato cars and coffee is huge (1st sunday of each month, hundreds of cars). And there is a c&c every weekend elsewhere. I can’t find a definitive schedule rn, but this pic is right for 2nd-4th weekend of the month in the north bay
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There are probably lots of others in the South Bay, East bay, and peninsula. I know Ferrari of Silicon Valley puts them on occasionally and they attract some pretty fancy stuff.
Also Alice’s Restaurant on skyline pretty much every day… though I haven’t been in the nsx