I'm tracking meetups at https://bitcointalk.org/index.php?topic=155600.0

Of course, this is the "Where to meet?" thread, though the poll is closed.

I'm pretty sure there are a lot more SoCal bitcoiners than there are contributors to this thread, so I'm glad you joined it.

You might be interested in the Society of Libertarian Enterpreneurs, which is meeting in three days.  They aren't bitcoiners per se - some are familiar and some aren't.