It is a 16-day festival running from late September to the first weekend in October with more than 6 million people from around the world attending the event every year. Locally, it is often simply called Wiesn, after the colloquial name of the fairgrounds (Theresienwiese) themselves. 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 original Munich event.
The Munich Oktoberfest originally took place during the 16 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 anniversary of the event.