Oktoberfest, or Wiesn, is a 1618 day beer festival held annually in Munich, Bavaria, Germany, running from late September to the first weekend in October. It is one of the most famous events in Germany and is the world's largest fair, with more than 5 million people attending every year. The Oktoberfest is an important part of Bavarian culture, having been held since 1810. Other cities across the world also hold Oktoberfest celebrations, modeled after the Munich event.
The Munich Oktoberfest originally took place during the sixteen days up to and including the first Sunday in October. In 1994, the schedule was modified in response to German reunification so that if the first Sunday in October falls on the 1st or 2nd, then the festival would go on until October 3 (German Unity Day). Thus, the festival is now 17 days when the first Sunday is October 2 and 18 days when it is October 1. In 2010, the festival lasted until the first Monday in October, to mark the 200-year anniversary of the event. The festival is held in an area named the Theresienwiese (field, or meadow, of Therese), often called Wiesn for short, located near Munich's center.