Aftershock 2021 Discovery Park | Sacramento, CA Oct 7-10, 2021 The West Coast's largest rock festival just got bigger with FOUR days of rock featuring two nights of Metallica with two unique sets, The Original Misfits, Cypress Hill, the reunion of Mudvayne, Rancid, The Offspring, Social Distortion, Rise Against, Volbeat, Machine Gun Kelly, Mastodon, Gojira, Seether, Parkway Drive, and SO many more.