The Velvet Revolution started at an official event for 50th anniversary of the closing of Czechoslovakian universities on November 17, 1939 by the Nazis in Prague. This event continued after its official end and was violently ended by state police on the street "Národní třída". In following days people organized meetings for protest against the actions of state police. 750-800 thousand people were at one of the biggest protests on November 25.