The Oktoberfest is a sixteen-day festival held each year in Munich, Bavaria, Germany during late September and early October. It is one of the most famous events in the city and the world's largest fair, with some six million people attending every year, and is an important part of Bavarian culture. Other cities across the world also hold Oktoberfest celebrations, modeled after the Munich event.
The first "Oktoberfest" took place in Munich, on October 12, 1810: For the commemoration of their marriage, Crown Prince Ludwig (later King Ludwig I) and Princess Therese of Saxe-Hildburghausen (namesake of the Theresienwiese festival grounds) organized a great horse race (the marriage took place on October 12; the horse race on October 17 — therefore, there are different dates named as being the first Oktoberfest).
The Munich Oktoberfest traditionally takes place during the sixteen days up to and including the first Sunday in October. In 1990, 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 will go on until October 3rd (German Unity Day). Thus, the festival is now 17 days when the 1st Sunday is October 2nd and 18 days when it is October 1st. The festival is held on an area named the Theresienwiese (field, or meadow, of Therese), often called d’ Wiesn for short.