Warren Haynes will spend a weekend at Red Rocks in early September. On September 1, the Allman Brothers Band will headline a performance at the lauded amphitheater, while Govt Mule will appear at the venue a night later. The Yonder Mountain String Band will supply opening duties both nights, the second high-profile opening spot the group has secured this week (Yonder Mountain has also been added to the side-stage at Dave Matthews Bands Randalls Island show). One and Two Day tickets for Friday and Saturday will be made available. Govt Mules next scheduled Red Rocks appearance will take place Glen Allen, VAs Innsbrook Pavilion.