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 was held for a week every third Samhain, when the nobles and ollams of Ireland met to lay down and renew the laws, and to feast. He also claims that the druids lit a sacred bonfire at Tlachtga and made sacrifices to the gods, sometimes by burning them in the fire. He adds that all other fires were doused and then re-lit from this bonfire. Traditionally, Samhain was a time to take stock of the herds and food supplies. Cattle were brought down to the winter pastures after six months in the higher summer pastures. It was also the time