This is a very valid question that still stumps me. According to the official White Sox website, "Tailgating is allowed in White Sox parking lots A-G and L before every home game until game time. Parking lots open two hours prior to game time."
So a few years ago, we show up two hours before the game, and the lots already have a bunch of cars in it. So next game, we show up 3 hours prior to game time, and STILL there are cars in the lots already tailgating. I am curious how soon they actually open up the parking lots. My group now always tries to arrive 2.5 to 3 hours before the game, park in lot B, and we are still in the 3rd or 4th row.