Band Type Opener Concerts by Band Title Band Date Ozzfest 2001 American Head Charge, Black Label Society, Black Sabbath, Crazy Town, Disturbed, Drowning Pool, Hatebreed, Linkin Park, Marilyn Manson, Mudvayne, Nonpoint, OTEP, Papa Roach, Slipknot, Spineshank, Systematic, Taproot, Union Underground July 07, 2001 Slipknot at Champions Square Slipknot, Hatebreed April 30, 2015