GRAND PRAIRIE, Texas--(BUSINESS WIRE)--Six Flags Entertainment Corporation (NYSE: SIX), the world’s largest regional theme park company, today announced a new partnership with Gildan USA Inc., centered around a national promotion with Summerfest, “The World’s Largest Music Festival,” in Milwaukee, WI. The program will launch April 16 with a national sweepstakes for a chance to win a fly-away trip for two to Summerfest® and to Six Flags Great America in Gurnee, IL. The winners will receive trave
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