A girl participates in St Patrick's day celebrations as she waits for a parade in the center of Belfast, Northern Ireland, March 17, 2015.

Participants take part during the annual St Patrick's Day Parade on March 17, 2015 in Dublin, Ireland.

The Grand Marshall of the St. Patrick's Day Parade, Archbishop Timothy Dolan, walks past protesters during the St. Patrick's Day Parade in New York, March 17, 2015.

Marchers walk past a group of protesters during the St. Patrick's Day Parade in New York, Tuesday, March 17, 2015. The group was protesting the exclusion of LGBT groups from the parade.

People take a selfie as hundreds of people make the St. Patrick's Day pilgrimage to the top of Slemish on March 17, 2015 in Ballymena, Northern Ireland. Slemish Mountain is the legendary first known Irish home of Saint Patrick.

Patrons celebrate St Patrick's Day at the Orient Hotel on March 17, 2015 in Sydney, Australia.

This image supplied by Tourism Ireland on March 16, 2015 shows the London Eye floodlit green to celebrate St Patrick's Day on Tuesday. Landmark buildings across Ireland and the world have been floodlit green as global celebrations of the Emerald Isle's patron saint are culminating in parades and celebrations in Dublin and other cities, particularly in the U.S., on St. Patrick's Day.

The Boston Police Gaelic Column marches down Broadway during the St. Patrick's Day Parade in South Boston, Massachusetts March 15, 2015.

The color guard for LGBT veterans group OutVets marches down Broadway during the St. Patrick's Day Parade in South Boston, Mass., March 15, 2015. For the first time in the 114-year history of Boston's St. Patrick's Day parade, gay rights activists marched openly on Sunday under rainbow banners in the city's annual celebration of its Irish heritage, after organizers lifted a longtime ban.

U.S. Rep. Seth Moulton poses for a photo with spectators while marching in the St. Patrick's Day parade, March 15, 2015, in Boston's South Boston neighborhood.

A boat travels down the Chicago River as the river is dyed green ahead of the St. Patrick's Day parade in Chicago, Saturday, March 14, 2015.

Phillis Lewis marches in front of a giant pride rainbow flag during the annual St. Patrick's Day parade in Memphis, Tenn., Saturday March 14, 2015.

Jacob Wood, 9, of Denver, yelled, "you can never have too many beads," during the Annual St. Patrick's Day parade in Denver, Colo., March 14, 2015.

Gary Carnes, aka "Shorty" marches in the Annual St. Patrick's Day parade in Denver, Colo., March 14, 2015.

Rowan Miller, 2, stands next to his Grandfather Ian Seivwright as the Shelby County Sheriff's Pipe Band warms up before the start of the annual St. Patrick's Day parade on Saturday, March 14, 2015 in Memphis, Tenn.

Members of the Irish Brigade fire into the air during the Annual St. Patrick's Day parade in Denver, Colo., March 14, 2015.