Warren Haynes (Gov't Mule, Allman Brothers), Richard Thompson, and the Indigo Girls are among the latest acts confirmed to appear at the Rocky Mountain Folks Festival. The 13th annual three-day event

Warren Haynes (Gov't Mule, Allman Brothers), Richard Thompson, and the Indigo Girls are among the latest acts confirmed to appear at the Rocky Mountain Folks Festival. The 13th annual three-day event in Lyons, Colo., will take place Aug. 15-17, and, as previously reported, will feature Norah Jones headlining on Aug. 16.

Haynes will turn out a rare solo acoustic set on the Planet Bluegrass-produced event's first night, while the Indigo Girls will close the festival's final day. Additional artists confirmed to perform are Patty Griffin, Todd Snider, Greg Brown, Dan Sheridan, the Nields, Darrell Scott, Christine Kane, Richard Julian, Xavier Rudd, and Utah Phillips. More artists will be announced in the coming weeks.

Three-day passes are on sale for $105 through Planet Bluegrass or 800-624-2422. Individual day tickets will go on sale Monday (May 5). Planet Bluegrass also produces two other renowned Colorado festivals: June's Telluride Bluegrass Festival and July's RockyGrass, also in Lyons.