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.
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