NEW YORK (AP) — The antipoverty nonprofit Global Citizen is no stranger to big stages. The advocacy group rallied more than 60,000 festivalgoers at its Central Park concert last year around issues of rainforest protection and energy access. But Global Citizen is preparing for its most ambitious production yet: the first-ever FIFA World Cup halftime show on July 19, curated with help from Coldplay vocalist Chris Martin . Super Bowl-style performances — uncommon in soccer — will feature Madonna,