There's never a bad time to throw a party atop the ArcelorMittal Orbit. On Halloween however, the thrills are greater than usual thanks to an army of undead revellers dripping in fake blood. A glass of witch's brew will be handed out to all in fancy dress, while DJ Frank McWeeny will be throwing down the tunes. Dress as crazy as you like – it's Halloween; anything goes. Over 18s only.