First Saturday Devotion 
The desire for a First Saturday devotion was revealed by the Blessed Virgin Mary to the three children at Fatima in 1917. On December 10, 1925, the Virgin revealed more details about the devotion to Sister Lucia, the only seer still alive at that time & a cloistered nun. From that time, the devotion has spread throughout the world.  The practice is conducted on the first Saturdays of every month.  (The Church traditionally honors Mary on Saturdays.)

First Saturday in the Chapel at Servants of Mary Center for Peace
Every First Saturday of the Month
Confessions 8:00 am
Rosary 8:30 am
Mass 9:00 am
Breakfast following

Purposes
To establish devotion (in accordance with God's wishes) to the Immaculate Heart of Mary, and to make reparation for...
Attacks upon the reality of Mary's Immaculate Conception.
Attacks against the reality of Mary's Perpetual Virginity.
Attacks upon Mary's Divine Maternity and the refusal to accept her as the Mother of all mankind.
Those who try to publicly implant in children's hearts indifference, contempt and hatred for the Immaculate Heart of Mary.
For those who insult Mary directly in her sacred images.

Practices
The devotion involves the following practices on five consecutive first Saturdays with the specific intention of making reparation for the offenses (listed above) against the Blessed Virgin.
Go to Confession. (within 8 days before or after the first Saturday)
Receive Holy Communion.
Recite five decades of the Rosary.
Keep me company for fifteen minutes while meditating on fifteen mysteries of the Rosary.  (separate from the Rosary itself)  Preferably done in the presence of the Lord in the Tabernacle or at Exposition.

Promises
The Virgin Mary's assistance at the hour of death with the graces necessary for salvation for those who practice the devotion. Salvation of souls and peace as a result of promoting of the Devotion to the Immaculate Heart.