STS9 has confirmed its annual appearance at Morrison, CO’s Red Rocks Amphitheatre. The group will return to the storied venue from September 9-10 and also appear at Denver’s more intimate Ogden Theatre on September 8. STS9 has performed at Red Rocks every year since 2003 when the band opened for The String Cheese Incident. STS9 has headlined Red Rocks each year since 2006. The ensemble will appear at Athens, GA’s Classic Center on April 20.