1. Korn & Rob Zombie at the Arco Arena (loudest concert ever)
2. Metallica at Cal Expo Amphitheater Theater
3. Megadeath at Cal Expo Amphitheater Theater
4. Red Hot Chili Peppers, I don't remember where (it was that good)
5. Korn, Limp Bizkit, Primus, and more at the family values tour.
There are many more, but I am having trouble remembering them all.