Wiccan Wallpapers for your Phone! Happy Imbolc Sabbat! Imbolc, also called Imbolg or St. Brigid’s Day, is a traditional Gaelic holiday that is celebrated by pagans worldwide, including Wiccans as one of the eight Sabbats. Imbolc marks the midpoint between the winter solstice (Yule) and the spring equinox (Ostara). As such, it is considered a cross-quarter day on the pagan wheel of the year, and it is often celebrated around February 1st or August 1st if you’re in the Southern hemisphere.