In reparation to the Immaculate Heart of Mary, this devotion consists of the following:
• Going to confession
• Receiving Holy Communion
• Praying the Rosary
• Meditating on the Mysteries of the Rosary for 15 minutes.
To learn more: https://www.catholic.com/.../first-saturday-devotion...
What is a devotion?
Devotions are "external practices of piety" that are not part of the official liturgy of the Catholic Church. It is not required to practice devotions, however, they can enhance spiritual development and help the faithful grow in love for Jesus and His Church.