Oktoberfest officially kicked off in Munich, Germany . More than 9,000 residents of nearby villages, many of them dressed in traditional Alpine attire, marched through the city as part of the annual celebration. Following the parade, it was time for beer - a lot of it. Last year, 7.3 million liters of it were served up. In addition to alcohol, revelers enjoyed live music, food, and dancing. The celebration, which attracts an average of six million people annually, dates back to 1810, where it originated as the celebration of the wedding of Bavarian Crown Prince Ludwig and Princess Therese of Saxony-Hildburghausen.