3rd May National Holiday (also May 3rd Constitution Day; Polish: Święto Konstytucji 3 Maja) is a Polish national and public holiday that takes place on 3rd May. The holiday celebrates the declaration of the Constitution of May 3, 1791. Festivities date back to the Duchy of Warsaw early in the 19th century, but it became an official holiday only in 1919 in the Second Polish Republic. Delisted during the times of the People's Republic of Poland, it was reestablished after the fall of communism in modern Poland.