Runners hit streets for Shamrock Shuffle

With 40,000 registered participants on board, the 32nd annual Bank of America Shamrock Shuffle 8K welcomes its largest field in history on Sunday.

The flat and fast course tours Chicago's downtown Loop, beginning and ending in Grant Park where the traditional Post-Race Party is held at Buckingham Fountain. In advance of race day, a two-day Health & Fitness Expo is held at Navy Pier for all participants, guests and fitness enthusiasts. The Expo is free and open to the public.

Here are the details for the weekend:

• Health & Fitness Expo at Navy Pier, Exhibition Hall A, from 10 a.m. to 8 p.m. today, and 9 a.m. to 6 p.m. Saturday.

• Shamrock Shuffle 8K race at Grant Park, 7-8:30 a.m. Sunday, begins at Monroe Street and Columbus Drive.

• Post-race party featuring live music by Holding Mercury and SODA at Buckingham Fountain

• Street Closures scheduled for Sunday, April 10:

Columbus Drive, from Randolph Drive to Grand Avenue

Grand Avenue, from Columbus Drive to Rush Street

Rush Street, from Grand Avenue to Hubbard Street

Hubbard Street, from Rush Street to State Street

State Street, from Hubbard Street to Jackson Boulevard

Jackson Boulevard, from State Street to Desplaines Street

Desplaines Street, from Jackson Boulevard to Van Buren Street

Van Buren Street, from Desplaines Street to Jefferson Street

Jefferson Street, from Van Buren Street to Harrison Street

Harrison Street, from Jefferson Street to Michigan Avenue

Michigan Avenue (northbound lanes only), from Harrison Street

to Roosevelt Road

Roosevelt Road (westbound lanes only), from Michigan Avenue

to Columbus Drive