Beltein
Beltein is held on May 1. Celtic celebration of the beginning of summer. This event in the first decade of the month May is annual. 
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Beltane, also spelled Beltine, Irish Beltaine or Belltaine, also known as Cétamain, festival held on the first day of May in Ireland and Scotland, celebrating the beginning of summer and open pasturing. In some Wiccan beliefs, this day marks the battle between the May Queen and the Queen of the Winter. Beltane is first mentioned in a glossary attributed to Cormac, bishop of Cashel and king of Munster, who was killed in 908. Cormac describes how cattle were driven between two bonfires on Beltane as a magical means of protecting them from disease before they were led into summer pastures—a custom still observed in Ireland in the 19th century. Other festivities included Maypole dances and cutting of green boughs and flowers.
Days before the proliferation of Christianity, ancient Pagans used to decorate themselves with greenery and flowers during Beltane, thus creating the tradition of Jack in the Green.
Similar holidays and events, festivals and interesting facts
Historic start of the new year on March 25 (Lady Day in England, Wales, Ireland, and the future United States until the adoption of the Gregorian calendar in 1752. The year 1751 began on 25 March; the year 1752 began on 1 January. It is one of the four Quarter days in Ireland and England);
May Crownings or the Virgin Mary Month on May 1 (Catholic Church tradition);
Harry Potter Day on May 2
Emergency Medicine Day on May 27
June Holiday in Ireland on June 1 (celebrated on the first Monday in June);
World Naturist Day on June 7 (Starts on the first Sunday of June in the northern hemisphere and on the first Sunday of December in the southern hemisphere);
Bloomsday on June 16 (Dublin, Ireland)
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