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Plot Your Escape is a free concert happening this evening in four locations. Free tickets are gone, but you'll be able to watch a live stream on their website. Here's the lineup:

Diddy and Mariah Carey will be performing at Gotham Hall in New York City.
Maroon 5 and Bareilles will be performing at Union Station in Chicago.
Mary J. Blige and Gavin DeGraw will be performing at Woldenberg Park in New Orleans.
Lil' Wayne and Cee Lo Green will be performing at Hollywood & Highland in Los Angeles.