Yule.

Yule and Litha as Midsummer are mentioned in the Lord of the Rings as the only celebrations of the Hobbits in the Shire. There was also a personal celebration of birthday. Nothing else. Tolkien must have thought that these two celebrations are the most ancient and most important. He knew best because he was a university professor who studied mythologies comprehensively.

Yule marks the begining of the year. It is the darkest day and the sun starts to rise back again renewing its cycle. Known as Solstice Night, or the longest night of the year, the sun's "rebirth" was celebrated with much joy. On this night, our ancestors celebrated the rebirth of the Oak King, the Sun King, the Giver of Life that warmed the frozen Earth. From this day forward, the days would become longer.

Bonfires were lit in the fields, and crops and trees were "wassailed" with toasts of spiced cider.  Children were escorted from house to house with gifts of clove spiked apples and oranges which were laid in baskets of evergreen boughs and wheat stalks dusted with flour. The apples and oranges represented the sun.  The boughs were symbolic of immortality (evergreens were sacred to the Celts because they did not "die" thereby representing the eternal aspect of the Divine). The wheat stalks portrayed the harvest, and the flour was accomplishment of triumph, light, and life. Holly and ivy not only decorated the outside, but also the inside of homes, in hopes Nature Sprites would come and join the celebration. A sprig of Holly was kept near the door all year long as a constant invitation for good fortune to visit tthe residents. Mistletoe was also hung as decoration.  It represented the seed of the
Divine, and at Midwinter, the Druids would travel deep into the forest to harvest it.

Herbs of Yule:
Bayberry, blessed thistle, evergreen, frankincense holly, laurel, mistletoe, oak, pine, sage, yellow cedar.

Foods of Yule:
Cookies and caraway cakes soaked in cider, fruits, nuts, pork dishes, turkey, eggnog, ginger tea, spiced cider, wassail, or lamb's wool (ale, sugar, nutmeg, roasted apples).

Incense of Yule:
Pine, cedar, bayberry, cinnamon.

Colors of Yule:
Red, green, gold, white, silver, yellow, orange.

Stones of Yule:
Rubies, bloodstones, garnets, emeralds, diamonds.

Spellworkings of Yule:
Peace, harmony, love, and increased happiness.

Deities of Yule:
Goddesses-Brighid, Isis, Demeter, Gaea, Diana, The Great Mother.
Gods-Apollo, Ra, Odin, Lugh, The Oak King, The Horned One, The Green Man.

Sources: J.R.R. Tolkien, Fellowship of the Ring and The Celtic Connection