I have heard twice today on KPCC that tomorrow (Saturday evening) there will be the following things happening:
5:00pm USC playing Oregon at the Coliseum
7:07pm Dodgers vs. Cubs Game 3
7:15pm UCLA vs. Washington State at the Rosebowl
8:00pm Neil Diamond at the Staples Center
There is also an Obama thing downtown with Hilary Clinton speaking in the evening as well.
So if you are heading down there for any of those things — ride a bike, take a bus, take a train, get there early, carpool, etc etc. If you were just going to head downtown for no good reason, I would avoid it like the plague!