Free overnight adventure in experimental traditions, hyper-modern flows and joyful noises from around the world, featuring Eric Chenaux, Slikback, Rian Treanor & Cara Tolmie, Silvia Tarozzi & Deborah Walker, John McCowen & Madison Greenstone, Lechuga Zafiro, Oùat, Placebo Domingo and many more. Cologne Stadtgarten, 18 October, sunset–sunrise, free.