I tried to google this to make sure of it, but I swear I have heard this on radio or TV, but my Uncle, who lives in California, actually told me this too.
But here is my fact (it may not be 100% accurate, but I'm going off memory):

In November, the annual "Iron Bowl" game is played between the Auburn Tigers and Alabama Crimson Tide. The game is such a big deal in the state that on game day the respective stadium and surrounding tailgaters make it the third largest city in the state at that time.

This year, it's in Auburn. I can't wait.