Welcome!
I'm in the LA area as well (east San Gabriel Valley), but used to live closer in. You may find some of the local shows worth going to, at least occasionally. I'll be happy to chat with you about that, perhaps more offline than on-. I'm no authority, but am happy to share an opinion, fwiw.
You probably know this, but the two biggest shows are the annual "SESCAL" show by LAX, and the annual "OrcoExpo" in Anaheim/Garden Grove. The OC one is strictly commercial, but is probably the largest regular show in the area. (The APS winter show was in Riverside this past February, which was quite a bit larger.)
But SESCAL is put on by a philatelic organization and has exhibits, seminars, club meetings, etc. In fact, if you happen to collect Japan or China, both of the specialized philatelic organizations for those fields will be holding their national conventions there this year. Some details here:
http://www.sescal.org/(Parking at SESCAL is still kind of a killer. The validated rate is $9, with very limited and restricted street parking around in that area, since it's so close to the airport. That hotel is not my favorite venue, but it is a very good show.)
Hope this is a bit helpful, and again, welcome!