Still fresh out of prison, Gucci Mane is apparently set to headline an 'All Lives Matter' concert in Biloxi, Miss. in September. The Mississippi Coast Coliseum and Convention Center posted a flyer for the event Wednesday afternoon. Billed as an 'All Lives Matter/Stop the Violence' concert, the event will feature Gucci Mane and "friends," with a portion of the proceeds going to benefit the families of Alton Sterling and Philando Castile.