GRIDLOCK SAM

ALTERNATE SIDE PARKING

IN EFFECT SATURDAY

TRAFFIC FORECAST for Friday through Sunday

Street fair season is upon us! First up is Washington Place, which will be blocked off from Grove St. to Sixth Ave. 9 a.m. to 7 p.m. Saturday. Waverly Place will close between Grove St. and Sixth

Ave. for its fair 9 a.m. to 7 p.m. Sunday. For street fair updates and detours, follow me at www.twitter.com/ Gridlocksam.

Occupy Wall Street is planning two marches Sunday afternoon: Protesters will gather at Zuccotti Park in lower Manhattan and at 1 Hanson Place (The Williamsburgh Savings Bank building) in Brooklyn 2 p.m. Sunday. The Zuccotti marchers will cross the Brooklyn Bridge to Cadman Plaza. The Hanson Place marchers will likely walk up Flatbush

Ave., to Tillary St. and join the others at Cadman Plaza for a general assembly at 4 p.m.

The New York Red Bulls host their second home game of the season with a 4 p.m. Saturday match in Harrison, N.J., against the Montreal Impact. Gamegoers should also expect impacts along 280 and Frank E. Rodgers Blvd. or take the PATH to Harrison or NJ Transit to Newark Penn Station.

At the Garden, the Rangers play 7:30 p.m. Friday and 7 p.m. Sunday while the Knicks shoot hoops 7:30 p.m. Saturday. The Hot 97 April Fools Comedy Show finds an audience at the Theatre at MSG 7:30 p.m. Sunday. Expect slow speeds on

Seventh Ave. between 33rd and 31st Sts. Ongoing construction will cause overnight closures of the access ramps from southbound and northbound FDR

Drive to the Brooklyn Bridge 11 p.m. Friday to 2 p.m. Saturday, 11 p.m. Saturday to 2 p.m. Sunday, and 11 p.m. Sunday to 6 a.m. Monday. Drivers should access the bridge from the Civic Cen

ter/pearl St. exit. Richmond Hill Rd. between Forest Hill

and Arthur Kill Rds. will be closed 8 p.m. Saturday to 6 a.m. Sunday for roadway resurfacing.