Imbolc - the first celebration after Yule. It marks the beginning of Spring.
Yeah, I know, your calendar says that Spring doesn't start until Ostara, but that is the same calendar that says Yule is the beginning of Winter, and was created by Pope Gregory XIII for political gains.
Believe me when I say Imbolc is the beginning of Spring. Here in the US, February 2nd is better known as Groundhog Day. This ritual celebration, where the groundhog comes out of his burrow, and looks for his shadow, to forecast the next six week's weather, is a variation on an old Scotts story about the Calliach, who goes out to gather the last of the wood for Her Winter hearth.
If the day is cool and grey, She gathers Her wood, and goes home. If the day is sunny and too warm, She casts a spell to bring back the Winter cold. How the Winter Queen became a furry rodent, I don't know, but the stories are too similar not to be related.
Instead of writing down all the information for you to read, I thought I would include recordings by Selena Fox, an internationally known Witch, on Imbolc.
Creating Imbolc Rituals