We could tie this article from The Catholic Company into our monthly Corporate Communion, as to why we hold it the First Saturday of the month.
First Saturday Devotion
The practice of the First Saturday Devotion was requested by Our Lady of Fatima, who appeared to three shepherd children in Fatima, Portugal, multiple times starting in 1917. She said to Lucia, the oldest of the three children: “I shall come to ask that on the First Saturday of every month Communions of reparation be made in atonement for the sins of the world.” Years later she repeated her request to Sr. Lucia the only one still living of the three Fatima Seers, while she was a postulant sister living in a convent in Spain. “Look, my daughter, at my Heart, surrounded by thorns with which ungrateful men that pierce me at very moment by their blasphemies and ingratitude. You at least try to console me, and say that I promise to assist at the hour of death, with the graces necessary for salvation, for all those, on the first Saturday of five consecutive months, shall confess, receive Holy Communion, recite five decades of the rosary, and keep me company for 15 minutes while meditating on the 15 mysteries of the rosary, with the intention of making reparation to me.”
First Friday Devotion
Our Lord appeared to St. Margaret Mary Alocoque (1647-1690), a French nun in the Visitation Order, and gave her the special task to spread devotion to His Most Sacred Heart at a time when religion was growing cold in the hearts of mankind. He said to her: “Behold this heart which, not withstands the burning love for men with which it is consumed and exhausted meets with no other return from most Christians than sacrilege, contempt, indifference and ingratitude, even in the sacrament of my love (The Eucharist). But what pierces my heart most deeply, is that I am subjected to these insults by persons especially consecrated to my service.” The specific conditions to receive the Great Promise of the Sacred Heart of Jesus: 1. Receive Holy Communion on nine consecutive first Fridays of the month (assuming the person is in a state of grace) 2. Having the intention, at least implicitly, of making reparation to The Sacred Heart of Jesus for all the sinfulness and ingratitude of men.