RELATED STORIES SIDEBAR (RIGHT) • Slayer reunites for explosive Thursday headlining set. SACRAMENTO – Aftershock Festival’s second day featured a variety of punk icons and modern rock heavyweights. The crowds felt bigger and the show went later into the night than on Thursday. Judging by the costumes, jumpsuits and scary masks in Discovery Park, it was easy to identify the excitement for the evening’s headliner. Friday’s lineup also offered up a few up-and-coming acts that delivered impressive sets.