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Festival-goers dance in mud on the grounds of the Wacken Open Air music festival in Wacken, northern Germany on August 3, 2023. The heavy metal music featival was forced to cap attendance after heavy rains turned its farmland venue into a muddy quagmire. Wacken Open Air, one of the largest heavy metal festivals in the world, is scheduled to take place from August 2 until August 5, 2023. (Photo by Axel Heimken / AFP) (KEYSTONE/AFP/AXEL HEIMKEN)