Imbolc.

Dziś w Irlandii i Szkocji obchodzony jest Dzień Świętej Brygidy wywodzący się z celtyckiego święta Imbolc ( wymawia się :  'im'olk') poświęconego Brigid - bogini wiosny, poezji lecznictwa i rzemiosła. Z dniem tym związane było także przepowiadanie pogody.
St Brigid's Day is also known as Feast-Day of Bride, Là Fhéill Bhrìghde, and Imbolc.
The early Celts all over Northern Europe celebrated this day as Imbolc. Imbolc (also spelt "Imbolg") comes from the Old Irish, "i mbolg" meaning "in belly." It is associated with the period when female sheep (ewes), pregnant with spring lambs, started to lactate and give milk again -- though this onset of lactation can vary up to two weeks before or after the 1st of February. Still, the 1st of February makes for a date that falls about halfway between the Winter Solstice and the Spring Equinox. 
Read more:
http://www.cooksinfo.com/st-brigids-day
http://culturalheritageireland.ie/index.php/irish-history-from-the-annals/80-irish-history-from-the-annals/174-the-festival-of-imbolc-and-st-brigit
or watch
https://www.youtube.com/watch?v=eH7okeqtY3o