sentences:  Later that day, on Twitter, Corey Taylor said Slipknot will release a greatest hits album on June 17, 2012.He also said the band was not yet recording new material but was putting together demos for a new album.Slipknot's first annual music festival, called "Knotfest", was held on August 17, 2012, at Mid-America Motorplex near Pacific Junction, Iowa, and on August 18, 2012, in Somerset, Wisconsin.