Stevie Wonder, Kings of Leon, Alicia Keys, and John Mayer will perform at a free ticketed festival on the Great Lawn in Central Park on September 28, 2013. The concert is part of a movement to encourage people to take action to end extreme poverty. 27,000 two person passes will be given away to people who sign up for the Global Citizen Movement and earn entries to the ticket drawing by taking certain actions. It’s all spelled out at the Global Citizen website.