Well it's hard to say, as I got to Tijuana about 8:30 PM and spent most of my time in the bars, but did walk around from bar to bar, and didn't see any fireworks, but when I finished the session with my nice young SG it was a little bit after Midnight and I saw a firework show in the sky, but was more concerned about the gun fire in the air that was still going on.
I wanted to beat the other people to the border as I thought it might be busy.