Then listen to the wailing of the Shannon Rovers Irish Pipe Band and watch the Chicago River turn green. The parade begins at noon starting from Balbo and Columbus. Chicago is going for the title of "greenest city in the world" this weekend for the second year in a row. "We will have the most buildings lit up in green of any other city in the world," said Blair Ciecko, director of ShamROCK Chicago. "I don't think we should have a problem nabbing the title of greenest city." Chicago's St. Patrick's Day celebrations will also include countless pub crawls, at least three parades and one very green river.