In 2015 Red Bull staged a series of secret gigs in an unused subterranean venue in North London. Unannounced until 24 hours before the show fans had to apply for tickets through various social media channels.
Headliners were Skepta, Hudson Mohawke and Charli XCX with guest appearances from Lion Babe, Giggs and Action Bronson.
Amplify put it all together and the results were pretty spectacular. For a video check this link.