For nearly a decade, metal institution Slipknot has been taking its day-long Knotfest extravaganza to countries around the world. Now that live music is coming back, Slipknot have big plans for the whole Knotfest thing. They’ve already announced a Knotfest cruise in August with bands like Anthrax, Behemoth, Ho99o9, and Higher Power. There are plans for festivals in the UK and Japan. And now the band has announced plans for a big return to their Iowa homestate with another Knotfest in September.