I found this sort of prayer online which celebrate's Imbolc:
Blessed be the earth, and all who dwell upon it.
We give thanks for the season now departing from us,
For the blessings it has bestowed upon us,
And upon those with whom we share this world.
Blessed be the new season.
We pray that it will be a time filled with peace,
With abundance, with prosperity,
Blessed be all who share this feast.
Let us now prepare for the time ahead
By opening our hearts, and our minds, and our spirits.
Imbolc is an ancient festival which celebrates the return to Spring and can be visualised as an old woman or crone handing over nature to a young maiden. It is celebrated on February 1st, which is also St. Brigid's Day. We all know about the Roman Catholic saint but the ancient Bridgit was a triple goddess and her powers extended to poetry, healing and she was a smith. There is a warrior aspect to Bridgit because she is of the Brigantes tribe of Northern England who were warriors. They were a Celtic tribe and the Brigantes lived in Ireland in Leinster too.
On Tuesday night you could have a feast, light some white candles and a warm fire and do some cleaning to welcome in Spring. I think I'll write a poem about it!