In 1624, a horrible plague haunted Palermo, and during this hardship St Rosalia appeared first to a sick woman, then to a hunter to whom she indicated where her remains were to be found. She ordered him to bring her bones to Palermo and have them carried in procession through the city.
The hunter climbed the mountain and found her bones in the cave as described. He did what she had asked in the apparition, and after the procession the plague ceased. After this St Rosalia would be venerated as the patron saint of Palermo, and a sanctuary was built in the cave where her remains were discovered.
The celebration, called the festino, is still held each year on July 15. It is still a major social and religious event in Palermo. In 1995, 1996, 1997 and 2001 the celebration has been produced by Studio Festi.
Also on September 8 there is an event related to the festino and St. Rosalia; a tradition of walking barefoot from Palermo up to Mount Pellegrino. In Italian American communities in the United States, the July feast is generally dedicated to Our Lady of Mount Carmel while the September feast, beginning in August, brings large numbers of visitors annually to the Bensonhurst section of Brooklyn in New York City. Her actual feast day is September 4th.