8 a.m. Haitian Americans rally during mortgage-fraud trial of former Haitian paramilitary leader Emmanuel Constant; across from the Brooklyn State Supreme Court, 320 Jay St.
9 a.m. Landmarks Preservation Commission public hearing; 1 Centre St, 9th Floor.
9 a.m. Workers showcase sewage skills at the NYC Department of Environmental Protection’s 21st Annual Operator’s Challenge; Jamaica Water Pollution control Plant, 150-20 134 St.
10 a.m. City officials and environmentalists announce anti-idling campaign; City Hall steps.
10 a.m. Meeting of the Board of Directors of the Convention Center Development Corporation; E.S.D.C. headquarters, 633 Third Ave., 37th Floor Conference Room.
10 a.m. Training program teaches airport workers how to be nice; JFK International Airport, Terminal 4, East End Arrivals Hall, first floor.
11 a.m. Joel Klein announces the Madison Avenue Gallery Walk to benefit the Fund for Public Schools; P.S. 6, 45 East 81st St., at Madison Avenue.
Noon. Stavros S. Niarchos Foundation honors Bob Woodruff for his work with U.S. veterans; The Lighthouse, Pier 61, Chelsea Piers, Westside Highway between 22nd and 23rd streets.
Noon. Unveiling of the “I Love NY” relaunch campaign at the Empire State Development luncheon; 620 Loft & Garden, 620 Fifth Ave.
1 p.m. City Council hearing on construction site safety legislation; Council Chambers, City Hall.
6 p.m. New York City Central Labor Council hosts Annual Labor Awards Reception at Tavern on the Green; Central Park West at 67th Street.