Holidays in Poland are regulated by the Non-working Days Act of 18 January 1951 (Ustawa z dnia 18 stycznia 1951 o dniach wolnych od pracy; Journal of Laws 1951 No. 4, Item 28). The Act, as amended in 2010, currently defines thirteen public holidays.
As this holiday always falls on a Sunday, it is not widely known that it is considered a non-working day, as all Sundays are already non-working days and holidays falling on Sunday don't give the right to another free day.
Under communist rule, the 1st of May was celebrated as Labour Day with government-endorsed parades, concerts and similar events. Following the 1989 changes, the Sejm decided to keep this day a public holiday but to give it the neutral name of State Holiday. In addition, the 3rd of May was created as Constitution Day. The May holidays (1st, 2nd and 3rd of May) are called "Majówka" in Polish, a pun made from the May month name (it can be translated as May-day picnic).
August 28 - Day of the Polish Air Force, set on the anniversary of pilot Franciszek Żwirko and mechanic Stanisław Wigura viotory in the Challenge 1932. Formerly, from 1918 to 1932 the anniversary of first Polish Air Force flight, 5 November, and during communist times, 23 August - first engagement by Polish airforce in the East
August 31 - Day of Solidarity and Freedom, set on the anniversary of August Agreement from 1980
Śmigus Dyngus Day on Easter Monday (the day following Easter Sunday) is when traditionally the young (and young of heart) have water fights, in continuation of a pagan spring fertility ritual observed in many other cultures,
September 1 - the day Germany invaded Poland in 1939, triggering World War II.