May 2 is observed as the Day of the Polish Flag.
During the main ceremony, the Polish flag has been hoisted at the mast of the Royal Castle's Clock Tower in Warsaw. Head of the National Security Bureau Aleksander Szczygło recalled that during the communist period, the white-and-red flags were removed after May Day so that they were not displayed on May 3, the anniversary of the democratic constitution of 1791. Constitution Day was re-introduced as a state holiday after the collapse of communism.