November 27 marks the feast of the Miraculous Medal, otherwise known as the medal of the Immaculate Conception. Though the feast honors the Immaculate Conception of the Blessed Virgin Mary, the memorial commemorates the anniversary of the apparition of the Mother of God to St. Catherine Laboure in Paris in 1830, wherein Our Lady showed the nun the medal she wished to be made for those to wear seeking her aid and protection. The Blessed Virgin spoke to Catherine: “Have a medal struck upon this model. Those who wear it will receive great graces, especially if they wear it around the neck.” Countless miracles followed, hence the name, the Miraculous Medal. The story here.
"O Mary conceived without sin, pray for us who have recourse to thee."
In 12 days the Church celebrates the Solemnity of the Immaculate Conception.