I will mention that winds can be a real issue in the California deserts.
Several of my club's trips to Red Rock Canyon State Park have been canceled or suffered badly. The winds actually blew over a members 25" dob on one memorable occasion (no damage thankfully). It (RRCSP) is just about an hours drive south of the GOSP location.
(We actually have a SP scheduled there at red cliffs for march 29 btw, a messier marathon theme.)
I am not saying to not go to GOSP, they explicitly mention giving a credit if they have to cancel, just be aware and check the weather beforehand if you are traveling a long distance!
I will mention that Chuchupate Campground parking lot and Mt. Pinos parking lot are not too far from Ventura, and allow overnight stays and are usually busy on dark weekend nights. They aren't star parties per se, but most non-imagers will happily let you look through their scopes if you ask politely.