Most celiac support groups on the L.A. basin are affiliated with the Celiac Disease Foundation (CDF), headquartered in Studio City:
The San Gabriel Valley Celiac Support Group serves Burbank, Glendale, Pasadena and the San Gabriel Valley areas of Southern California. The service area lies between Burbank and San Dimas, and between La Cañada and Whittier.
The area lying between Hollywood and Santa Monica is served by Los Angeles Celiac, a Yahoo! group moderated by Suzanne Frieder.
To the south thereof, the area lying between Norwalk and Inglewood is served by Gluten Free Way 105, another Yahoo! group, which is moderated by yours truly.
And to the south thereof, the beach cities to the south of Santa Monica are served by the South Bay Celiacs, headed by Caitlin Richter, whose blog is Gluten Free in Los Angeles.
But in Orange County, the Celiac Sprue Association (CSA) has a chapter as well as its California coordinator.
In the spring, CDF hold its annual education conference and food faire; and in the fall, CSA's Orange County chapter also holds a food fair.