Check this out:
If I were you, I'd call the couple of places referenced, and ask. These are serious beer people, so they may very well have cask-conditioned ales, or if not, probably can point you in the right direction. And, please report back on what you find !!!
Not every BJs has cask conditioned beer on hand, and generally they only have it one day each week, and they sell out in a few hours. Here's the overview:
Brea, California, 92821-5764
Call ahead, they don't have a fixed schedule. There are no guarentees if you just show up.
24032 El Toro Road
Laguna Hills, California, 92653-3104
They serve cask-ale every Thursday at 5pm. They generally sell out the same night they tap the cask.
461 West Esplanade Drive
Oxnard, California, 93036-1298
(805) 485 1124
Every Thursday, call ahead, they don't tap the cask on a fixed schedule and there are weeks in which they sell out quickly.
2917 East Eastland Center Drive
West Covina, California, 91791-1603
(626) 858 0054
Thursday or Friday, call ahead.
6424 Canoga Avenue
Woodland Hills, California, 91367-2407
(818) 340 4546
No fixed schedule, call ahead.
These locations only offer one real ale each week, and generally only for a few hours at a time. The selection rotates, and it's best to call ahead and ask what they will be serving before heading out with high hopes.
NONE of the other BJs locations have Cask Conditioned ale. Period. They only have nitro-tapped, pasteurized, keg beer... which is just not the same. There is not a single hostelry within 20 miles of Westwood that serves real cask-conditioned ale. Sorry.