Following its first, sold-out experiment in socially distanced concerts at Red Rocks last week, Colorado Symphony has announced another 10 shows in its Red Rocks Amphitheatre acoustic series. Limited to 175 audience members at the 9,450-capacity venue, the shows take advantage of Red Rocks’ open-air beauty and acoustically tuned environs to present unamplified sets from the stage. They also represent the first proper concerts performed at the world-famous venue in the 2020 summer season.