What is Imbolc? Imbolc is a cross-quarter Sabbat, the third in the Celtic wheel of the year. The Celtic year begins at Samhain. In some documents, the year begins with Wassail. Imbolc is celebrated on the 1st of February in the calendar, but astrologically it has shifted to the 5th. This festival is dedicated to the goddess Brigid, daughter of The Dagda and one of the Tuatha Dé Danann. The Significance of Brigid Brigid is a goddess of spring, new beginnings, pregnancy, birth