On Saturday, 40 pounds of vegetable dye will be used to turn the Chicago River emerald green for St. Patrick’s Day. Dating back to 1962, this tradition began with a plumber using dye in an attempt to track down the origins of illegal sewage flowing into the river. Savannah, Ga., will dye the water in its park fountains green for several days before hosting the second-largest St. Patrick’s Day parade in the country.

Residents of Seattle will celebrate with a 10-day festival that includes film screenings, a soda bread contest, and a four-mile race. A flatbed truck will paint a green stripe along the planned parade route, ending it with a painted shamrock.

At the Missouri University of Science and Technology, a parade will run along streets painted solid green with mops. It will be the 101st annual parade at the school.

In Washington, D.C., President Obama will keep with presidential tradition by welcoming the taoiseach of Ireland, whose position is comparable to that of a prime minister, and accepting a bowl of shamrock from him.

Here in New York, thousands will march in New York City’s parade, the longest-running St. Patrick’s Day parade in the country. It began in 1762 when Irish soldiers fighting alongside the British marched through the city in celebration.

And on Sunday, Wolfie will join Stony Brook’s dance team and cheerleaders at the Rocky Point St. Patrick’s Day parade, which will begin at 1 p.m. at Harrison Avenue and Route 25A.