Slipknot had teased that a big announcement was coming on Monday, June 4, via their Twitter page on Saturday (June 2), but it looks like the folks at Ticketmaster have let the news ... slip. It appears the band will headline their own Knotfest in their home state of Iowa on Aug. 17, and the bill will also feature Deftones, Lamb of God, Serj Tankian, Dethklok, the Urge and Prong.

[Update: Slipknot have now confirmed Knotfest, and it's two shows, not one. See all the details and full lineups here.]

The event will take place at the Mid America Motorplex in Pacific Junction, Iowa. Tickets for the festival are slated to go on sale on Friday, June 8, at the reasonable price of $35 each.

Slipknot's teaser Tweet includes a picture of a circus tent, which could very well be the stage setup for Knotfest. The event will occur after Slipknot's run on the Rockstar Energy Drink Mayhem Festival tour ends in early August. It also will follow Slipknot's performances at the Heavy T.O. and Heavy MTL festivals in Canada the weekend of Aug. 11-12.

In recent days, Slipknot have been releasing a series of teaser videos for an upcoming greatest-hits package due July 17, plus singer Corey Taylor reported that the band is in the early stages of working on demos for a new album. All in all, it looks like its going to be a busy summer for the band.