Dyngus Day
Dyngus Day is held on April 6. It is very popular in Poland, as well as in Polish communities across America. This event in the first decade of the month April is annual. 
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Dyngus Day falls the day after Easter and celebrates the end of lent. Historically a Polish tradition, Dyngus Day celebrates the end of the observance of Lent and the joy of Easter.
Dyngus Day can be traced all the way back to a holiday called Śmigus-Dyngus that is celebrated both in Poland and the Ukraine. The traditions of this holiday began back in 966 A.D. with the baptism of Prince Mieszko I and the celebrations following the first Polish monarch being baptized into Christianity.
The use of water is said to evoke the spring rains needed to ensure a successful harvest later in the year. Girls could save themselves from a soaking by giving boys "ransoms" of painted eggs (pisanki), regarded as magical charms that would bring good harvests, successful relationships and healthy childbirths.
Similar holidays and events, festivals and interesting facts
Birthday of the "father of pedagogy" Jan Amos Comenius in the Czech Republic on March 28
Teachers' Day in Czech Republic and Slovakia on March 28
International Provenance Research Day on April 8 (Held on the second Wednesday of April);
Unfairly Prosecuted Persons Day in Slovakia on April 13 (Deň nespravodlivo stíhaných);
National Library Workers Day in Hungary on April 14
Memorial Day for the Victims of the Holocaust in Hungary on April 16
Feast of love in Czech Republic on May 1
May Crownings or the Virgin Mary Month on May 1 (Catholic Church tradition)