The lineup for Riot Fest 2013 has been announced and headliners include Fall Out Boy, Blink 182, and a mystery performer. Taking place at Humboldt Park in Chicago, IL September 13-15, the festival will also feature, Violent Femmes, Motorhead, Rancid, Blondie, A.F.I., Bad Religion, Brand New, Sublime with Rome, Public Enemy, Guided By Voices, Taking Back Sunday and more.