December 25th - January 6thMari Lwyd (The Grey Mare)A distinctive, ancient folk custom, often performed between Christmas Day and Twelfth Night. A decorated horse's skull on a pole, draped in a white sheet and carried by a person underneath, is led by a group of wassailers. They visit houses and engage in a rhyming contest, known as pwnco, with the occupants. If the Mari Lwyd party wins the battle of wits, they are invited in for refreshments and are believed to bring good luck.