Riot Fest have announced the addition of Pixies, Joan Jett & the Blackhearts, Suicidal Tendencies, Andrew W.K., Hatebreed, T.S.O.L.  Off With Their Heads, The Flatliners, Nativ, Hostage Calm, The Interrupters, New Beat Fund and Pet Symmetry to their 2013 Chicago festival. Motörhead, Bad Brains and Attack Attack! will not be playing the festival this year, as originally announced. The Chicago Riot Fest and Carnival takes place September 13-15 at Humboldt Park in Chicago, IL. Tickets are now available via TicketFly.