Guaranteed, there are more dates, they couldn't afford to keep buses out with full crew for that long without there being shows.
And I'd love a Buffalo off-date again - even though it was only main stage, the whole crew went and we got to spend the day at the amusement park next door. I was on a roller coaster called the Mind Eraser while listening to Slayer in the background, it was pretty badass. That night we had a party where Scott Ian was DJ and it was metal as fuck.
Stop by the Metal Blade tent at Mayhem this summer, dammit