Uhh....
You should probably go to the 3rd Street Promenade.
Most places will probably be small sports bars and/or super crowded in Venice and Santa Monica.
Your best bet is probably Hooters on the 3rd Street Promenade which has a ton of big screens everywhere. There are a few other restaurants there as well, your best bet is on the top floor of the mall structure, but I'm not sure how they'll be. Barney's Beanery is on the promenade and has huge TVs on the walls, but it might be hard to sit (its around the corner from hooters). Loteria Grill is an upscale mexican restaurant that has a big TV and they have a bunch of soccer flags and shit, its right next to the Adidas store on the Promenade.
Yardhouse in Marina Del Rey might be ok, the TVs aren't that big there from what I recall though but its a pretty big space and easy parking.
I remember you said you were at the Custom Hotel I think near the Airport in the past? If not its on the corner of Lincoln and Manchester. There's a mexican restaurant across the street called "Cinco" that has some pretty big TVs. Not sure if they'll be open for the game, but they might be and it'll probably be more low key there. You should probably call.
There's a big get together in the South Bay (Hermosa/Redondo) I think its in Redondo, the last one had a shitload of people there.