On the 8th of December we celebrate "The Feast of The Immaculate Conception". This means we celebrate that Mary was always without sin, from the moment she existed. She was without sin so that she could be full of goodness and worthy of being the mother of Jesus. The prayer we say today is "Oh Mary conceived without sin, pray for us who have recourse to thee" Or you can say Mary's favourite prayer, the Hail Mary.
