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The annual 'Thrill the World' event is a flashmob 'Thriller' dance that takes place simultaneously at locations around the world. There are two London gatherings at Piccadilly Circus at 3pm BST and 2am GMT (beware, the clocks go back at 1am), plus a 'Funky Zombie Afternoon Tea' following the afternoon event and a 'Dark Zombie Funky Party' before the 2am dance. You can learn the moves online or join official practices and workshops in advance. See website for details. Dressing up, by the way, is a must.