As usual, Slipknot does what other bands cannot. The band is bringing back their Knotfest event back home as Knotfest Iowa this September and it features a ton of bands such as The full line-up features Slipknot headlining, with Faith No More, Megadeth, Lamb Of God, $uicide Boy$, Gojira, Trivium, Tech N9ne, FEVER 333, Knocked Loose, Turnstile, Gatecreeper, and Vended. The event will be the biggest heavy music festival to ever hit the mid-western state and will be held at National Balloon Classic Field in Indianola, IA, on Saturday, September 25th. Tickets will be available on pre-sale to Knotfest.com subscribers from 10am Central time on today (Tues, May 25th), with a general on-sale from 10am Central on June 4th, at the link below. Slipknot has also announced they have returned to the studio to record their new album.