While Joel Zimmerman — better known as the man under the signature mouse helmet and moniker, ‘deadmau5’ — is making a familiar return to Red Rocks for two nights, Nov. 7th and 8th, he will be missing an iconic piece of his act. Zimmerman has officially retired, ‘the Cube’, an elevated, LED-paneled, rotating stage that has dazzled concertgoers since it first appeared in 2010 at Coachella. Instead, Red Rocks will be the official debut for a new stage design that Zimmerman has spent around a month