against me! 4 times
alkaline trio 8 times
warped tour 3 years straight (avenged sevenfold, atreyu, thrice, fall out boy, the offspring, dropkick murphys, saves the day, the dan band, throwdown, new found glory, thursday, all-american rejects, mxpx, no use for a name, and a few more i can't really remember)
those might be the only real notable ones i've been to. 2 of them were actually the same shows. against me opened for alkaline trio in vegas then in san diego the next night. greyhounded it from vegas to orange county where i caught a ride to san diego an hour later. awesome right? i met all 3 members of alkaline trio in vegas.