The Polish National Flag Day, also known as the Day of the Flag of the Republic of Poland, is a national holiday in Poland which takes place on 2 May every year. The holiday is celebrated on the day between two national holidays: 1 May and 3 May.
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The last day of the Festival of Ridván (Baháʼí Faith) (this date is non-Gregorian and may change according to the March equinox
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Twelve-day festival in the Baháʼí Faith
International Workers’ Day or Labour Day (International)
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May 1 celebration of the roles of law in the United States
May Day (beginning of Summer) observances in the Northern hemisphere (see April 30): Calan Mai (Wales)
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Traditional Welsh festival
May Day (beginning of Summer) observances in the Northern hemisphere (see April 30): Beltane (Gaelic)
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Gaelic May Day festival
Day of Remembrance for all Victims of Chemical Warfare (United Nations)
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Annual commemorative event