Hedonism returns on the 30th — KK’s longest-running night, and the one where black tie gives way to something far more flamboyant. Through an unassuming door in Covent Garden: sauna, jacuzzi, steam room, canapés and a premium open bar included. Doors 9.30pm, strictly nothing after 10.30pm, closing at 2.30am. Masks on until the play spaces open. Members only, Kittens £100.