Originally Posted by brutal_descent
No, they aren't; Slayer are playing in Moscow on the 20th, and Exodus are playing Graspop on the 22nd.
Edit: Scratch that, Slayer are playing the same day as Exodus!
Haha, was about to say, Slayer are playing the 22nd so I assumed Exodus were play 21st based on what you'd said.
Maybe Gary will do a guest appearance on a song with Exodus?