Oktoberfest traditionally starts on the third weekend in September, and ends the first Sunday of October. It began with the Royal Wedding on 12 October 1810.
Crown Prince Ludwig, later to become King Ludwig I, was married to Princess Therese of Saxony-Hildburghausen on 12 October 1810. The citizens of Munich were invited to attend the festivities held on the fields in front of the city gates to celebrate the happy royal event. The fields were renamed Theresienwiese ("Grassland of Therese") to honor the Crown Princess, although the locals have since abbreviated the name simply to "Wiesn". Horse races in the presence of the royal family marked the close of the event that was celebrated as a festival for the whole of Bavaria. The decision to repeat the horse races in subsequent years gave rise to the tradition of Oktoberfest. In the first few decades, the choices of amusements were sparse. In 1818, the first carousel and two swings were set up. Visitors were able to quench their thirst at small beer stands, which grew rapidly in number. In 1896 the beer stands were replaced by the first beer tents and halls set up by the enterprising landlords with the backing of the breweries. The remainder of the festival site was taken up by a fun-fair. The range of carousels offered was already increasing rapidly in the 1870's as the fairground trade continued to grow and develop in Germany.