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 Middle Irish writer notes that Samhain is also called "Féile Moingfhinne" (the Festival of Mongfind or Mongfhionn), and that "women and the rabble make petitions to her" at Samhain. Many other events in Irish mythology happen or begin on Samhain. The invasion of Ulster that makes up the main action of the "Táin Bó Cúailnge" ('Cattle Raid of Cooley') begins on Samhain. As cattle-raiding typically was a summer activity, the invasion during this off-season surprised the Ulstermen. The "Second Battle of Magh Tuireadh" also begins on Samhain. The Morrígan and The Dagda meet and have sex before the battle against