I think that what happened at Fatima is an event that is ongoing, with urgent ramifications for us today.
Taken all together, the central message of Our Lady in her apparitions at Fatima is the urgent need to pray, do penance, and make reparation for sins, our own and those of others.
This major theme was prepared before Our Lady started to appear in May 1917.
In the late September or early October of 1916 an angel appeared to the three children of Fatima to whom Our Blessed Mother would later appear 100 years ago today.
The angel taught them a prayer, an act of reparation.
The angel calling himself the Angel of Peace held a chalice over which was suspended a Host. Drops of the Precious Blood fell from the Host into the chalice. The angel prostrated himself on the ground before the Host and Chalice, and repeated the act of reparation three times. He then administered Holy Communion to the children saying, “Eat and drink the Body and Blood of Jesus Christ, horribly outraged by ungrateful men. Make reparation for their crimes and console Our Lord.”
An Act of Reparation From the Angel of of Peace at Fatima:
Most Holy Trinity, Father, Son and Holy Ghost, I adore You profoundly and I offer You the most precious Body, Blood, Soul and Divinity of Jesus Christ, present in all the tabernacles of the world, in reparation for the outrages, sacrileges and indifferences by which He Himself is offended. And by the infinite merits of His Most Sacred Heart and the Immaculate Heart of Mary, I beg of You the conversion of poor sinners.