The Oktoberfest (also called Wiesn) is a German festival that takes place on the Theresienwiese, a public place in the center of Munich, Bavaria. It is every year, in late September and early October. It is a big social event. There is lots of eating and drinking. It is on for sixteen days ending on the first Sunday in October. If this is the first or the second the festival is extended to the end on 3 October, the Day of German Unity. This is the day when East Germany and West Germany joined into one country again in 1990.