It was just before midnight Sunday, the final night of the annual HoCo festival at Hotel Congress, and the Denver-based band DeVotchKa was singing the final chorus of "How It Ends."
Suddenly, the stage outside Hotel Congress blinked dark and there was silence. The band continued playing on now acoustic instruments as DeVotchKa lead singer Nick Urata mouthed the words into a dead mike.
 He looked out into the audience and coaxed them to sing along in the dark.
"And you already know / Yet you already know / How this will end," the crowd sang.
"It was a sweet ending," said HoCo organizer David Slutes, who said someone tripped the power source and they couldn't figure out how to restore it. Some people had speculated that the city had cut the power since the concert was coming close to the midnight curfew; Slutes said that wasn't the case.
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  "What would have been catastrophic any other time of the weekend was almost beautiful and sweet," added Slutes, the entertainment coordinator for Club Congress. "It was two-thirds into their show and we were running 20 minutes late. Sergio Mendoza was set to go on at midnight and he was playing with them, so it worked out perfectly."
 Slutes said the four-day HoCo Fest, which kicked off Thursday and ran through Sunday, boasted record-breaking attendance. More than 3,000 people attended throughout the weekend.
 "I think this was the best one in smoothness and number of people," he said. "We sold out that final night. It's all good."
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