Wikipedia
Mercuralia
Mercuralia is a Roman celebration known also as the "Festival of Mercury". Mercury (Greek counterpart: Hermes) was the god of merchants and commerce. On May 15 merchants would sprinkle their heads, their ships and merchandise, and their businesses with water taken from the well at Porta Capena. They would usually do this for good luck because Mercury is the god of commerce and luck.
Category:Ancient Roman festivals Category:May observances