Samhain step from guising to playing pranks". Playing pranks at Samhain is recorded in the Scottish Highlands as far back as 1736 and was also common in Ireland, which led to Samhain being nicknamed "Mischief Night" in some parts. Wearing costumes at Halloween spread to England in the 20th century, as did the custom of playing pranks, though there had been mumming at other festivals. At the time of mass transatlantic Irish and Scottish immigration, which popularised Halloween in North America, Halloween in Ireland and Scotland had a strong tradition of guising and pranks. Trick-or-treating may have come from the custom
Samhain try to emulate the historic festival as much as possible. Other Neopagans base their celebrations on sundry unrelated sources, Gaelic culture being only one of the sources. Folklorist Jenny Butler describes how Irish pagans pick some elements of historic Samhain celebrations and meld them with references to the Celtic past, making a new festival of Samhain that is inimitably part of neo-pagan culture. Neopagans usually celebrate Samhain on 31 October – 1 November in the Northern Hemisphere and 30 April – 1 May in the Southern Hemisphere, beginning and ending at sundown. Some Neopagans celebrate it at the astronomical midpoint