holidays
May Eve, the eve of the first day of summer in the Northern hemisphere (see May 1): Beltane begins at sunset in the Northern hemisphere, Samhain begins at sunset in the Southern hemisphere. (Neo-Druidic Wheel of the Year)
Related Wikipedia articles
Beltane
Gaelic May Day festival
Beltane or Bealtaine is the Gaelic May Day festival, marking the beginning of summer. It is traditionally held on 1 May, or about midway between the spring equinox and summer solstice. Historically, it was widely observed in Ireland, Scotland, and the Isle of Man. In Ireland,…Source: Wikipedia (CC BY-SA)
Samhain
Gaelic festival marking the start of winter
Samhain or Sauin is a Gaelic festival on 1 November marking the end of the harvest season and beginning of winter or the "darker half" of the year. It is also the Irish and Scottish Gaelic name for November. Celebrations begin on the evening of 31 October, since the Celtic day…Source: Wikipedia (CC BY-SA)
Druidry (modern)
Modern nature-based spiritual movement
Druidry, sometimes termed Druidism, is a modern spiritual or religious movement that promotes the cultivation of honorable relationships with the physical landscapes, flora, fauna, and diverse peoples of the world, as well as with nature deities, and spirits of nature and place.…Source: Wikipedia (CC BY-SA)
Wheel of the Year
Annual cycle of seasonal festivals observed by modern pagans
The Wheel of the Year is an annual cycle of seasonal festivals, observed by a range of modern pagans, marking the year's chief solar events and the midpoints between them. Modern pagan observances are based to varying degrees on folk traditions, regardless of the historical…Source: Wikipedia (CC BY-SA)