Find out what time Holy Mass is, at your local Catholic Church (assuming of course, that May 13th does not fall on a Sunday). Go to Confession. Pray the Holy Rosary. A very fitting way to observe this Marian Feast Day, as Mary strongly urged devotion to the 3 children at Fatima. Adore Christ in the Blessed Sacrament. Consecrate yourself to the Sacred Heart Of Jesus, and the Immaculate Heart of Mary. Another fitting way to observe this Feast Day, because Mary stressed that God Wished to Establish devotion to her Immaculate Heart. When you are praying to God, ask Blessed Jacinta and Francisco Marto to pray for your intentions (the same with Sister Lucia Dos Santos, even though she has not been Beatified yet).