Twiztid have revealed some of the guests that will be joining them at their “Astronomicon 4” convention. The event will take place at the Sheraton Ann Arbor Hotel in Ann Arbor, MI on August 20-22 and it will feature: Corey Taylor (Slipknot, Stone Sour), Spencer Charnas (Ice Nine Kills), Bill Moseley (“House Of 1000 Corpses”,…