The Rotor is an amusement park ride that first demonstrated during a festival held in what city?
Rotor (ride):  The ride was first demonstrated at Oktoberfest 1949, and was exhibited at fairs and events throughout Europe during the 1950s and 1960s. Oktoberfest:  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.
Munich