My favorite shoots in California do not attract large numbers of participants. For example, there is a two day trad only shoot in Petaluma and a two day trad only shoot in the foothills to the east of Fresno, both in the fall, that usually have around 200 participants. These shoots have been put on since long before I became active in traditional archery 30 years ago. Each year, I look forward to seeing “old friends” that I see only at these tournaments.
I pass on attending the big 3D shoot in Redding in May, because I do not enjoy being there with such a large number of people. But it is coming up soon, and may offer you what you want.