Aftershock 2026 is officially locked in, and the West Coast’s largest rock, punk, and metal festival is returning to Discovery Park October 1–4, 2026 with its biggest lineup to date. Headlining this year’s Aftershock Festival are My Chemical Romance, TOOL, Limp Bizkit, Pierce the Veil, $uicideboy$, Queens of the Stone Age, The Offspring, A Day…