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The outer concourse of the upper deck at Wrigley Field provided a perfect view Wednesday of Gallagher Way as it suddenly, unexpectedly turned into an outdoor rave.
One minute, baseball fans were hanging out in anticipation of Game 3 of the National League Division Series between the Cubs and Brewers. The next, hundreds of dancing maniacs were jumping to a pulsating techno beat. DJ John Summit — a big name in EDM circles, but you knew that already — was on his game and in full command, treating all in earshot to a surprise pop-up concert.