GREENSKY BLUEGRASS live at Red Rocks Amphitheatre on Friday, September 18th, 2020 has been rescheduled to Friday, September 17th, 2021. There is nothing you need to do as your tickets will be valid for the new date. AEG Presents is thrilled to announce GREENSKY BLUEGRASS live at Red Rocks Amphitheatre on Friday, September 17th, 2021. Download the Red Rocks app before your visit. From digital ticketing with touchless entry, mobile ordering with express beverage pickup, park and venue maps, visitor tips, original Red Rocks content and more, the official Red Rocks app has everything you need for an unforgettable concert experience.