General view of the Wacken Open Air festival on August 1, 2018 in Wacken, Germany. Wacken is a village in northern Germany with a population of 1,800 that has hosted the annual festival, which attracts heavy metal fans from around the world, since 1990. (Photo by Gina Wetzler/Getty Images)





A festival goer from the Bavarian town of Diessen near Munich plays air guitar made of empty beer cans as his scantily dressed friends perform a heavy metal song at the world's largest heavy metal festival, the Wacken Open Air 2019, in Wacken, Germany on August 3, 2019. (Photo by Wolfgang Rattay/Reuters)





A sеx toy is pictured at the camp site of the world's largest heavy metal festival, the Wacken Open Air 2019, in Wacken, Germany on August 2, 2019. (Photo by Wolfgang Rattay/Reuters)





A festival goer from the Bavarian town of Diessen near Munich wears a pig mask as he drinks sweet mead, the official mead of the world's largest heavy metal festival, the Wacken Open Air 2019, in Wacken, Germany on August 3, 2019. (Photo by Wolfgang Rattay/Reuters)





A festivalgoer does “head banging” during the performance of German death metal band Damnation Defaced at the world's largest heavy metal festival, the Wacken Open Air 2019, in Wacken, Germany on August 3, 2019. (Photo by Wolfgang Rattay/Reuters)





Fans pose for photographers during the Wacken Open Air 2019 heavy metal festival in Wacken, Germany on August 3, 2019. (Photo by Alamy Live News)





The metal band “Hamatom” play at the world's largest heavy metal festival, the Wacken Open Air 2019, in Wacken, Germany on August 3, 2019. (Photo by Alamy Live News)





A heavy metal fan sticks out his tongue as he surfs on top of the crowd during the performance of the German power metal band “Powerwolf” at the world's largest heavy metal festival, the Wacken Open Air 2019, in Wacken, Germany on August 3, 2019. (Photo by Wolfgang Rattay/Reuters)





Some of the revellers dress up in elaborate costumes at the world's largest heavy metal festival, the Wacken Open Air 2019, in Wacken, Germany on August 3, 2019. (Photo by Action Press/Shutterstock)





A man in fancy dress poses for the camera at the world's largest heavy metal festival, the Wacken Open Air 2019, in Wacken, Germany on August 3, 2019. (Photo by Action Press/Shutterstock)





Festivalgoers watch two actors of the Wasteland Warriors movement fight in a cage at the world's largest heavy metal festival, the Wacken Open Air 2019, in Wacken, Germany on August 3, 2019. (Photo by Wolfgang Rattay/Reuters)