Dyngus Day is held on May 3. It is very popular in Poland, as well as in Polish communities across America. This event in the first decade of the month may is annual.
Mother's Day in Hong Kong on May 2 (also Hungary, Lithuania, Mozambique, Portugal, Spain, Romania; celebrated on the first Sunday in May);
Victory Day in Poland and Czech on May 8 (Narodowy Dzień Zwycięstwa in Poland established in 2015);
World Embroidery Day or International Vyshyvanka Day on May 20 (Celebrated on the third Thursday of May. Festival of culture of the East Slavic traditional embroidered shirt. Usually, an embroidered shirt was made from a homemade cloth, which was woven on a loom);
Children's Day in Hungary on May 30 (celebrated on the last Sunday in May);