San Diego California holds it's annual St. Patrick's Day Parade on the Saturday before March 17th. Each year, The Parade is lead by the Pipe and Drum Band of the San Diego Fire Department's Emerald Society. The San Diego St. Patrick's Parade is the largest West of the Mississippi and the third largest in the U.S.A. Of course, the New York Parade is held on March 17th when the center stripe down Fifth Aveue is painted green. In Chicago, the Chicago River is dyed green.