St Brigid’s Day, February 1, marks the start of Celtic Spring
Imbolc, also known as the Feast of Brigid, on February 1, celebrates the arrival of longer, warmer days and the early signs of spring.
It is one of the four major "fire" festivals (quarter days), referred to in Irish mythology from medieval Irish texts. The other three festivals on the old Irish calendar are Beltane, Lughnasadh, and Samhain.
The word Imbolc means literally "in the belly" in the old Irish Neolithic language, referring to the pregnancy of ewes.