St. Patrick's Day

Prince William, Duke of Cambridge attends a St Patrick's Day parade by the 1st Battalion Irish Guards as they visit Aldershot Barracks on St Patrick's Day, March 17, in Aldershot, England.

Revellers attend St Patrick's Day festivities in Dublin on March 17.

Children dressed as St. Patrick make their way to the St. Patrick's Day parade in Limerick, Ireland, March 17.

People dressed in costume wait for the parade to start during the Singapore St. Patrick's Day street Festival at Boat Quay on March 17 in Singapore.

A reveller shows off her green, white and gold eyelashes as she attends St Patrick's Day festivities in Dublin on March 17.

Doc Foley leads the Yonkers, N.Y., Fire Department Pipe and Drum in Savannah’s 189-year-old St. Patrick’s Day parade on Saturday, in Savannah, Ga. Started in 1824 by early Irish immigrants to Georgia, the parade has ballooned into a sprawling street party that is Savannah's most profitable tourism event.

Jacob Tidwell, center, and his friends Donavan Mock, left, and Preston Vasquez react to a band during Savannah’s St. Patrick’s Day parade on Saturday, in Savannah, Ga.

Gaudy green revelers crammed the oak-shaded sidewalks of downtown Savannah for the St. Patrick's Day parade on Saturday, in Savannah, Ga.

Workers begin dying the Chicago River green to kick off the city's St. Patrick's Day celebration on Saturday in Chicago. The dying of the river has been a tradition in the city for 43 years.

Dancers from the Tooromeen School of Dance perform during the St. Patrick's Day parade in Chicago, on Saturday.

David Westerby of Kenosa, Wis., yells during the St. Patrick's Day parade in Chicago on Saturday. With the holiday itself falling on a Sunday, many celebrations were scheduled instead for Saturday because of religious observances.

Spectators watch as the Chicago River is dyed green right before the start of the St. Patrick's Day parade in Chicago, on Saturday.

People dance during a St. Patrick's Day Parade in Moscow, Russia, on Saturday.

Bagpipers march in the 252nd annual Saint Patrick's Day parade in New York, on Saturday.

Revelers watch the 252nd annual St. Patrick's Day parade on Saturday in New York City. The parade honors the patron saint of Ireland and was held for the first time in New York on March 17, 1762, 14 years before the signing of the Declaration of Independence.

Members of the Ireland Police wait to join the rest of the parade on Fifth Avenue during the 252nd New York City St. Patrick's Day parade on Saturday.

Steven Anderson and Kimberly Anderson watch the St. Patrick's Day parade in New York, on Saturday.

An emergency crew responds to a woman during the 252nd annual St. Patrick's Day parade on Saturday in New York City.