Oktoberfest offers another opportunity in the calendar for a themed costume party. Originally a Bavarian custom, Oktoberfest has spread across Europe and the Rest of the World and is now celebrated globally.The origins of the Oktoberfest date back to the marriage of Prince Ludwig I to Princess Therese of Saxony-Hildburghausen on October 12, 1810. All of the residents of Munich were invited to celebrate the marriage in the surrounding fields. The celebrations lasted five days and ended with a horse race.The following year the event was repeated but based around …