The first Oktoberfest was held in 1810 to celebrate the wedding of Prince Ludwig, who later became King Ludwig I of Bavaria. The celebration featured horse races, which were repeated the following year, and the festival became an annual event. Beer stands were introduced in 1818, and these were changed to the now-famous beer tents in 1896. The drink is a major feature of the event, and this year's visitors are expected to top last year's numbers of 5 million liters of beer and 650,000 pork sausages consumed.