Aftershock 2024 Lineup Rumors. Slayer just showed aftershock festival why they're still the undisputed kings of thrash metal with a devastating headline set for the ages. The west coast’s largest rock festival, aftershock, is back with its most stacked lineup to date, featuring 130+ bands across.

The west coast’s largest rock festival is adding a 5th stage,. The west coast’s largest rock festival, aftershock, is back with its most stacked lineup to date, featuring 130+ bands across.