Watch on Soap2day. On June 13, 2009, Slipknot headlined the annual Download Festival in the UK, performing in front of 80,000 of their rabid fans. The performance was typical Slipknot, coming on the heels of one of the strongest years in Slipknot‘s illustrious career…annnd they filmed it for a DVD. 30 cameras captured ths (sic)ness on tape.