The Immaculate Conception means Mary was always free of original sin. From the very moment of her conception, she was never stained by original sin. The word immaculate literally means pure, or without blemish.
Eat something white Celebrate by eating vanilla ice cream or white cake (you can even decorate it with a blue "M" for Mary).
Pray a Marian prayer Pray the Hail Mary or Hail, Holy Queen. Or praying the Magnificat, Mary’s own prayer and her longest speaking part in the Bible, is a wonderful prayer for any Marian feast day. You can also stop by the Mary Statue in the Chapel at St. Francis Xavier. Light a candle for a loved one who is struggling and ask for Mary's help in praying for that person.