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Expect congestion around Seattle as tens of thousands attend a variety of events. Here are some of the bigger ones:

March of Dimes March for Babies

Start: 9 a.m. Seattle Center grounds

Participants: 4,000

March route: Exits Seattle Center grounds at Second and Mercer; east on Mercer to Fifth; south on Fifth to Cedar; west on Cedar to Second; south on Second to Spring; U-turn at Spring and north on Second back to Seattle Center; expect congestion along the route.

Opening Day Boat Parade and Windermere Cup

Dragon-boat race: 10:05 a.m.

Crew race: 10:20 a.m.

Parade of boats: noon

Where: Montlake Cut, Portage Bay and Union Bay

Attendance: 10,000

Bridge notes: The Montlake Bridge will be closed to vehicles from 10 a.m. to about 4 p.m. Bridges on the Ship Canal may open more frequently than usual due to heavy boat traffic.

Birth of Buddha Parade

Start: 10 a.m. Hing Hay Park

Participants: 900

Parade route: From Maynard and King, moves north on Maynard to Jackson; east on Jackson to the Red Apple supermarket parking lot at 23rd Avenue South. Police will escort.

Fiesta 5K Olé!

Start: 9:30 a.m. Volunteer Park on Capitol Hill

Participants: 1,700

Route: Leaves Volunteer Park at 14th and Prospect; goes east on Prospect to 15th; north on 15th to Howe; west on Howe to Federal; south on Federal to Prospect; east on Prospect to 12th; south on 12th to John; U-turn, then north on 12th back into Volunteer Park.

Seattle Sounders vs. Philadelphia Union

Match: 1:30 p.m. at CenturyLink Field

Expected attendance: 34,000

Seattle Mariners vs. Minnesota Twins

Game: 6:10 p.m. at Safeco Field

Expected attendance: 22,000