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 when the 'doorways' to the Otherworld opened, allowing supernatural beings and the souls of the dead to come into our world; but while Bealtaine was a summer festival for the living, Samhain "was essentially a festival for the dead". "The Boyhood Deeds of Fionn" says that the "sídhe" (fairy mounds or portals to the Otherworld) "were always open at Samhain". It tells us that the High King of Ireland hosted a great gathering at Tara each Samhain. Each year the fire-breather Aillen emerges from the Otherworld and burns down the palace of Tara after lulling everyone to sleep with his