First Saturday of December

On Saturdays, Catholics traditionally have taken part in the "First Saturdays Devotion" which entails going to Mass and receiving Communion for the first Saturday of the month for 5 consecutive months in reparation to the Immaculate Heart of Mary. This devotion is not to be confused with the First Friday's Devotion, which is dedicated to the Sacred Heart of our Lord Jesus Christ.

On July 1, 1905, Pope Pius X approved and granted indulgences for the practice of the First Saturdays of twelve consecutive months in honor of the Immaculate Conception. The First Saturday Devotion did not originate as part of the apparitions of our Blessed Lady in Fatima, but the devotion did quickly spread further following our Lady's series of appearances to the three shepherd children in 1917.

Our Blessed Lady's words to Sr. Lucia at Fatima:

Look, my daughter, at my Heart encircled by these thorns with which men pierce it at every moment by their blasphemies and ingratitude. You, at least, strive to console me, and so I announce: I promise to assist at the hour of death with the grace necessary for salvation all those who, with the intention of making reparation to me, will, on the first Saturday of five consecutive months, go to confession, receive Holy Communion, say five decades of the beads, and keep me company for fifteen minutes while meditating on the fifteen mysteries of the Rosary. 

The First Saturday Devotion consists of offering the First Saturday of the month for five consecutive months in reparation for the many and grievous sins committed in our world. A further explanation of our Lady's request is below:

• You must go to the Sacrament of Confession. Your reception of the Sacrament may be 8 days before the Saturday as long as you stay in a state of grace.
• You must receive the Holy Eucharist and as always, it must be in the state of grace or risk the most grievous sin of sacrilege
• You must pray 5 decades of the Holy Rosary of our Lady, including the Fatima Prayer.
• Finally, the last requirement consist of "keeping Mary company" for 15 minutes while meditating on all of the Mysteries of the Rosary with the intention of making reparation to her. This can be done by reading Scripture or other writings relevant to the Mysteries, meditating on pictures of the Mysteries, or simple meditation. Materials for meditation and education on each of the Rosary mysteries is available online.