The latter replaced the Foo Fighters when the band dropped out following the death of drummer Taylor Hawkins. Last year’s event was the first to experiment with a fourth day of programming with a part-day lineup on Thursday. That led to 145,000 attendees packing Discovery Park. This year, promoters went further with four full days and 90 acts.

Aftershock returns as Northern California’s loudest fest and the largest hard rock festival on the West Coast with four full days of music in Sacramento’s Discovery Park Oct. 6 to 9. While the bill is heavy on rock, Aftershock boasts an eclectic range of headliners in Slipknot, KISS, My Chemical Romance and Muse.

Aftershock has seen consistent growth from its 2012 inception, when Stone Temple Pilots headlined the inaugural one-day event. The event has been at Discovery Park every year, save one, when it was moved to the nearby Gibson Ranch.

This year the festival expands to three full days of performances, taking place at Discovery Park near the city’s downtown. There will be a special onsite collaboration with Metallica‘s Blackened Whiskey and Enter Night Pilsner.