Question: The Rotor is an amusement park ride that first demonstrated during a festival held in what city?

full_context: Document 1: Roller coaster: A roller coaster is a type of amusement ride that employs a form of elevated railroad track designed with tight turns, steep slopes, and sometimes inversions. People ride along the track in open cars, and the rides are often found in amusement parks and theme parks around the world. LaMarcus Adna Thompson obtained one of the first known patents for a roller coaster design in 1885, related to the Switchback Railway that opened a year earlier at Coney Island.<ref>
Document 2: Enterprise (ride): The Enterprise is an amusement ride, manufactured primarily by HUSS Park Attractions and Anton Schwarzkopf beginning in 1972. The HUSS ride was an adaptation and improvement of a design produced earlier that year by Schwarzkopf, with an increased passenger capacity. Despite not owning the original incarnation of the ride, HUSS was issued the patent.
Document 3: Gravitron: The Gravitron (also known as the Starship, Starship 2000, Starship 3000, Starship 4000, Starship Area 51, Starship Gravitron, Starship Exodus, Alien Abduction, Alien Invasion, Twister, Devil's Hole, Area 51, and Enterprise) is an amusement ride, most commonly found as a portable ride at fairs and carnivals. The Gravitron first appeared at Morey's Piers in 1983 and quickly became a fixture at amusement parks in many countries. It is a modification of an earlier ride called the Rotor. The ride was originally designed and manufactured by Wisdom Industries, though several examples of the Gravitron were produced under license by ARM in the UK and Ferrari in Australia.
Document 4: Zierer: Zierer Karussell- und Spezialmaschinenbau GmbH & Co. KG (Short name: Zierer) is a German company located close to Deggendorf. Zierer manufactures Tivoli and Force line of roller coasters, as well as panoramic wheels, wave swingers, flying carpets, "Hexentanz" and "Kontiki" rides. The company also has partnered with Schwarzkopf to build "Lisebergbanan" at Liseberg and "Knightmare" at Camelot Theme Park.
Document 5: 1. Münchner FC 1896: 1. Münchner FC 1896 was a German association football club in Munich, Bavaria whose origins were in the formation on 5 September 1896 of the club "Terra Pila" (Latin: earth + ball) by a group of students playing football on the city's Theresienwiese, which is today the official ground of the Munich Oktoberfest. Both "1. FC" and "FC Nordstern München" laid claim to being the earliest football club in the city and were made up primarily of students. Alongside "FC Bavaria 1899 München", these clubs are notable as founding members of the German Football Association (Deutscher Fußball Bund or German Football Association) at Leipzig in 1900.
Document 6: UFO (ride): The UFO is an amusement park ride designed by HUSS Maschinenfabrik in 1978, based on the company's Enterprise and Skylab amusement rides. Numerous carnivals feature this ride which is known as Alpha One Peeters and Vertical Limits.
Document 7: Internationales Dixieland Festival Dresden: Internationales Dixieland Festival Dresden is a jazz festival in Germany. It first took place in 1971. As Germany's oldest and Europe's biggest old-time jazz festival it is a firm fixture in the European scene. For eight days and seven nights, the capital of Saxony becomes Swingin' Dresden and draws up to around half a million jazz fans to the city, depending on the weather. One of the annual highlights is the riverboat shuffle on the Elbe, when the world's oldest and largest fleet of paddle-steamers becomes a floating stage and festival-goers are invited to step aboard. The climax is the Dixieland parade through the city centre, which culminates in a farewell jazz session.
Document 8: Oktoberfest bombing: The Oktoberfest bombing was a terrorist attack with a right-wing radical background. On 26 September 1980, 13 people died and 211 were injured after the explosion of an improvised explosive device at the main entrance of the Oktoberfest in Munich, West Germany. The attack is considered to be the most severe act of terrorism in post-war West Germany. The attack was attributed to the right-wing extremist and geology student Gundolf Köhler who was killed while placing the explosive device; however, doubts remain as to whether he acted alone. Attempts to re-open the investigation in the years following the bombing have not been successful.
Document 9: Stuttgart Spring Festival: Stuttgart Spring Festival (in German called Stuttgarter Frühlingsfest or sometimes vernacular Cannstatter Wasen or just Wasen) is an annual fair that takes place in the German city of Stuttgart between the middle of April and the beginning of May. The festival takes place on the "Cannstatter Wasen", traditional fairgrounds in Stuttgart's Bad Cannstatt district. It is slightly smaller than the festival in the autumn (and therefore occasionally also called the "small Wasen"), but it is the largest spring festival in Europe. Like the autumn fair, the Frühlingsfest offers a variety of fairground attractions. The tallest attraction is the 47 metre Ferris wheel and the fair almost invariably features a major roller coaster.
Document 10: Bayern Kurve: The Bayern Kurve is an amusement ride made in both a portable and park model that debuted in 1965 and was invented by German engineer Anton Schwarzkopf. During the ride, riders sit in one of the sixteen bobsled-themed cars that travel at a high-speed around a circular single-hilled track. Riders start in an upright position and as the cars pick up speed, they tilt inward toward the center of the ride. This ride is also known for its loud horn which is similar to that of a diesel train engine that blasts its loud roar when the ride reaches maximum speed. Also akin to a train, the seamed track creates the same rail "click-clack" railway sound, particularly at the lower section of track in the front. Additionally, the ride has a distinct whine that increases with speed due to its tire/blade drive.
Document 11: Bauernfest: Bauernfest (also called the Festival of the German Settlers) is a traditional festival that is held to honor the Germans that immigrated to Brazil. It is held during the month of July in Petrópolis, a city with a strong German influence, which is located in the highlands region of the state of Rio de Janeiro, southeastern Brazil. Since 1989 the Bauernfest has been held every year in the city center. It is considered the largest festival in the Petrópolis region, and the second largest German festival in Brazil, behind the Oktoberfest of Blumenau, in Santa Catarina. The festival features folk dances, choirs, traditional bands such as the "Banda Musical Germânica " (Germanic Musical Band) of Blumenau, contest beer drinking. Typical savory foods include sausages, Sauerkraut, Wurstsalat, Sauerbraten and so forth. The main beverage is beer, desserts and confectionery include chocolate and Black Forest cake. In 2012, there were 368,000 participants who spent R$ 55 million (US$ 24 million). In 11 days of celebration 7.5 tons of sausage and 35,000 liters of beer were consumed.
Document 12: Rotor (ride): The Rotor is an amusement park ride, designed by German engineer Ernst Hoffmeister in the late 1940s. The ride was first demonstrated at Oktoberfest 1949, and was exhibited at fairs and events throughout Europe during the 1950s and 1960s. The ride still appears in numerous amusement parks, although travelling variants have been surpassed by the Gravitron.
Document 13: Bockfest: Bockfest is an annual beer festival held in Over-the-Rhine, Cincinnati, Ohio on the first full weekend of March. It is the oldest German-style bock beer festival in the United States. It drew an estimated 20,000 attendees in 2013 and 30,000 in 2014. Bockfest originated from the 1992 special release of a beer by Hudepohl Brewing Company. Hudepohl released a bock beer under the name of the Christian Moerlein Brewing Company, the largest pre-prohibition brewery in Cincinnati. Bockfest is a celebration of bock beer, Cincinnati's brewing heritage, the Over-the-Rhine neighborhood, and the coming of Spring.
Document 14: Olympia Looping: Olympia Looping, also known as Munich Looping, is a portable steel roller coaster designed by Anton Schwarzkopf and built by BHS. It is the largest portable roller coaster in the world, and the only one with five inversions. It appears at many carnivals in Germany, most notably Oktoberfest, where it made its debut in 1989. It is named for its five vertical loops, which resemble the Olympic rings. Although they are clothoid-shaped, their shape is closer to circular than the ones on most other roller coasters, so they exert unusually high "g"-forces on the passengers (up to 5.2 g). The entire structure weighs 900 tons and requires a space 85 m wide by 36 m deep. The ride usually runs with five cars per train, though at events such as Oktoberfest and Winter Wonderland in Hyde Park, London, it runs with seven to increase throughput in busy periods.
Document 15: Oktoberfest: Oktoberfest (] ) is the world's largest Volksfest (beer festival and travelling funfair). Held annually in Munich, Bavaria, Germany, it is a 16- to 18-day folk festival running from mid or late September to the first weekend in October, with more than 6 million people from around the world attending the event every year. Locally, it is often called the Wiesn, after the colloquial name for the fairgrounds, Theresa's meadows ("Theresienwiese"). The Oktoberfest is an important part of Bavarian culture, having been held since the year 1810. Other cities across the world also hold Oktoberfest celebrations that are modelled after the original Munich event.
ground_truth: Munich