Yule is one of the 8 pagan Sabbats and falls around December 21st. Being a solstice, this is the shortest day (and longest night) of the year.
Yule is a day to celebrate the rebirth of the God (who died at Samhain) and the return of the sun, as the days grow longer. The Christian holiday of Christmas is based on these Yule celebrations. You might decorate your altar with holly, mistletoe or pine bows. Celebrate by making a pine cone wreath, roasting chestnuts and giving presents to friends and family!