 During the Velvet Revolution, a plain next to the Letná Park ("Letenská pláň") was the site of some important demonstrations against the Communist government.On the 25th and 26 November 1989 approximately 750,000 people protested in here.Pop Superstar Michael Jackson kicked off his HIStory World Tour at the park on September 7, 1996, approximately 130,000 people attended the concert.