Instagram/Brandi Carlile & MUNA & L Music Brandi Carlile, MUNA, Hayley Williams & Mitski lead the 2026 All Things Go Festival at Merriweather Post Pavilion, Sept 25-27. May 5, 2026 AceShowbiz - The upcoming 12th edition of the All Things Go Music Festival in the D.C. area has unveiled an exciting lineup featuring Brandi Carlile, MUNA, and Lola Young among its headliners. The event will take place over three days, from September 25 to 27, 2026, at Merriweather Post Pavilion in Columbia, Maryland.