If it stops raining, you can attend the following events:
Forest Hills Candlelight Ceremony - At Remsen Memorial Park (Alderton St and Trotting Course La), 7 p.m., September 11, 2007.
9/11 Concert in Cunningham Park - Friends of Cunningham Park sponsor a memorial concert by the Bobby Curtis Band in the main field near Union Turnpike, Fresh Meadows, 7 p.m., September 11, 2007.
Bayside Hills Commemoration - Candles and speakers at memorial plaque (Bell Blvd and the Horace Harding Expy, Bayside), 7 p.m., September 11, 2007. Bring candles.
Ozone Park Memorial - Reading of 9/11 victims names during commemoration at the Joseph Addabbo Playground, 133rd Ave and 82nd St, Ozone Park, 7 p.m., September 11, 2007.
Juniper Valley Park Candlelight Vigil - Speakers, music, and candlelight vigil in Juniper Valley Park (Juniper Blvd South and 78th St), starting 7:30 p.m., September 11, 2007. Thousands come bringing candles, flags, and flashlights, and a chance to see, in the distance, the towers of lights in Manhattan.
The September Concert for 9/11 at Socrates Park - In remembrance of 9/11, the little Opera Theater of NY performs on the banks of the East River, Socrates Sculpture Park (Vernon at Broadway, LIC), 6:30 p.m., September 11, 2007.
September Concerts in Astoria - Cafes and restaurants throughout Astoria will host small tribute concerts, part of the September Concert series, on September 11, 2007.
In Breezy Point, usually an outdoor mass on the evening of 9/11 is held at the 9/11 Memorial, Tribute Park (Rockaway Point Blvd and Beach 218th St), but I haven't been able to confirm this year's. Parking is possible at the church across the street, or else farther east on Rockaway Point near Beach 209th. Even if there isn't an event, the Breezy Point 9/11 Memorial at Tribute Park is a profound place to visit and remember. - John Roleke
Candlelight Ceremony in Astoria Heights - Candlelight ceremony at memorial grove in McManus Memorial Park (81st St and Grand Central Pkwy, Astoria Heights), 7:30 p.m., September 12, 2007.
If not, there are these indoor events:
"Requiem" Concert in Ridgewood - The St. Matthias Church Concert Choir perform "Requiem," at St. Matthias Church, on Catalpa Ave, between Onderdonk and Forest Aves, Ridgewood, 7:30 p.m., September 11, 2007.
Memorial Service in Kew Gardens - at Church of the Resurrection, 85-09 118th St, Kew Gardens, 7:30 p.m., September 11, 2007.
List courtesy of About.com