July 18 is the anniversary of the first apparition of Our Blessed Mother to St. Catherine Labouré. From the YouTube channel of Mary’s Miraculous Medal:

“The Miraculous Medal Shrine is proud to announce its Saint ALIVE program, in which St. Catherine Labouré comes to life, sharing the story of Mary and the Miraculous Medal. It is a fresh and exciting way to bring a miraculous piece of Catholic history to life.”

Listen to this account of the first apparition.