You should be able to find a barbox 8-ball tourney ANY night of the week in the metro San Diego area. In fact, on most nights, you can have your pick of which to play.
Most are $5 to $10 entry, single game races, Double elimination. BIH, call pocket/call shot vary. Most start between 7pm and 9pm. There's a pretty regular crowd of C and B shooters that make the circuit during the week. You'll get to know everyone's face after a couple weeks. Toby, Ski, Grasshopper, Marco, Jimmy, Ramon, Chimo, Raul, are all the usual suspects.
Here is link with a few of the tourneys:
http://poolshooter.blogspot.com/2009/01/san-diego-area-pool-tournaments-updated.html
Otherwise, check the "bar advertisements" in the SD Reader. They usually list a "pool" night.
I'm going to rattle off a few bars off the top of my head. It's been 18 months since I lived in SD, so it's up to you to confirm these are still going.
Lancers, University Heights, Sunday. (I used to run it. Tell 'em Ed sent you!)
In Cahoots, Mission Valley, Sunday.
Stadium Club, Mission Valley, Monday.
Tiny's, Ocean Beach, Mon.
Camel's Breath, Grantville, Wed.
In Cahoots, Mission Valley, Thurs.
Plus,
On Cue, College Billiards, Pal Joey's, Channel One, Janey's, Renegades, the Library, Lou Jones Inn, Leucadian, Silver Fox, the Alibi, Hungry Stick.
Good luck.