The Day the Sun Danced
This movie is an excellent introduction for children to the apparitions at Fatima, which occurred to three shepherd children in Fatima, Portugal in 1913. Lucia and her cousins, Francisco and Jacinta, are out herding sheep when an angel appears to them.
This apparition is followed a few days later by an appearance of the Virgin Mary. In spite of pressure from their parents and the local authorities to discontinue going to the cova, the children won't recant and they continue to go. On October 13th of that year, the "Miracle of the Sun" took place in front of thousands of spectators.