I am consulting my daughter's book "Celtic Wicca" about the Winter Solstice, or Yule. Having finished the harvest from the fields, farmers turned to the forests at this time of year to make sure enough firewood was harvested.
This is a time for renewal and faith. Set aside some time to be solitary, don't try to socialize all the time. The celebration of Epona, the Celtic horse goddess, is December 18. Call upon her before making journeys, and wear or decorate the tree with a small metal horse charm.