Imbolc is one of the four principal festivals of the Irish calendar, celebrated among Gaelic peoples and some other Celtic cultures either at the beginning of February or at the first local signs of Spring. Originally dedicated to the goddess Brigid, in the Christian period it was adopted as St Brigid's Day. In Scotland the festival is also known as Là Fhèill Brìghde, in Ireland as Lá Fhéile Bríde, and in Wales as Gwyl Ffraed.
Imbolc is traditionally a time of weather prognostication, and the old tradition of watching to see if serpents or badgers came from their winter dens is perhaps a precursor to the North American Groundhog Day. A Scottish Gaelic proverb about the day is:
Thig an nathair as an toll
La donn Bride,
Ged robh tri traighean dh’ an t-sneachd
Air leachd an lair.
"The serpent will come from the hole
On the brown Day of Bride,
Though there should be three feet of snow
On the flat surface of the ground." 
Fire and purification are an important aspect of this festival. Brigid (also known as Brighid, Bríde, Brigit, Brìd) is the goddess of poetry, healing and smithcraft. As both goddess and saint she is also associated with holy wells, sacred flames, and healing. The lighting of candles and fires represents the return of warmth and the increasing power of the Sun over the coming months.