STS9 will return to Colorado’s famed Red Rocks Amphitheatre on September 7 and 8 for their “Cave of Crystals” shows, and the band has announced a warm-up gig in Denver on September 6.

The group will be playing opening night at the relaunched Denver venue Summit Music Hall. Tickets go on sale this Friday, June 15.

See STS9’s full touring schedule here.