Thousands of beer enthusiasts have gathered in Munich for the opening of Oktoberfest, which kicked off with the traditional tapping of the first beer keg. Mayor Dieter Reiter marked the beginning of the 189th Oktoberfest at noon by tapping the keg, officially launching the festivities. The celebration will continue until October 6, featuring 18 large tents spread across the fairgrounds, making it the largest folk festival in the world.