One for the hardened raver, this: Ralph Lawson celebrates two decades of Leeds clubbing institution BacktoBasics, of which he was the original resident, as well as his own revered 2020Vision label, with a nonstop, twelve-hour onslaught of discerning house and techno capers. Scene stalwart Andrew Weatherall and the new breed of house stars, represented by Subb-Ann and Burnski, join in the celebrations.