You can join a MS Walk in 2011, here's the link www.walkMSsocal.org
. You can also become a fan of the National MS Society on FB. I know there's a support group here in Southern Cali that meets every now and then, I think they even meet in Riverside. You'll find people on that page involved in those meetings.
I live in Southern Cal as well but I don't attend those support groups. I do participate in the walk though, you are more than welcome to join my team, it's called Team Sarah - A Step in the Right Direction.
October 29, 2009 - Dx with RRMS
June 22, 2010 - Dx's changed to Devic's (NMO)
January 4, 2011 - Dx w/Syringomyelia T4-T9, Migraines, and Possible MS (again - long story)