The Romería de El Rocío is a procession/pilgrimage on the second day of Pentecost to the Hermitage of El Rocío in the countryside of Almonte, Andalucia, Spain, in honor of the Virgin of El Rocío. From Wikipedia
Security forces mobilized more than 7,000 personnel to manage nearly a million pilgrims during the overnight climax of Spain’s largest Marian pilgrimage.
