And don't miss those that have wider use than one town. Sta Maria del Carmen, patron of mariners, is celebrated in the same day in July in many a coastal town that had a fishing industry. The statue leaves the church and is paraded around in people's shoulders, taken to the port, and often sent on a short trip on one of the boats. The locals prayed for plenty fish, and for the fishermen to avoid dying at sea. You can trace that kind of thing to a polytheistic world quite well.