A Listing of Memorial Events

Via The Gothamist:

The ceremonies will be aired on WABC 7, WCBS 2, WNBC 4, WNYW 5, WWOR 11, and NY1. Church Street will be closed between Battery Place and Barclay, as are Cedar, Cortlandt, Dey, Fulton, Vesey and Barclay Streets between Broadway and Church. And here are some other events around the city:
8AM-3PM: Saint Paul's Chapel offers prayer and civil services.
8:30AM: Ceremonies at the Healing Field, Floyd Bennett Field, Brooklyn.
8:45AM-3PM: Trinity Church has a number of events, including the tolling of change-ringing bells and musical performances.
10AM-5PM: St. Vincent's Hospital Trauma & Wellness Center - A Day of Healing will have a drop-in tent in Battery Park (near the sphere) offering "stress management services to restore calm and provide respite, as we remember that day and continue to move forward, together."
Noon-5PM: Staten Island borough-wide blood drives (PDF).
6PM-9PM: The New York Buddhist Church's Annual 9-11 Memorial Floating Lanterns Ceremony, south side of Pier 40 building at West Houston. "The ancient custom of floating lighted lanterns in waterways symbolizes respect for the lives of people who have gone before us. It also represents a light of hope for peace and harmony that we send over the waters of transmigration." - more information here (PDF).
7PM: "The September Concert: An Evening of Remembrance and Celebration" at St. Patrick's Cathedral.
Sunset: Tribute in Light, the light installation at West and Morris Streets, is turned on at sunset and will remain lit until dawn on Wednesday.
The New-York Historical Society's Here is New York: Remembering 9/11 exhibit opens.
More...

In addition, the NYU Chaplains' Circle is organizing a walk for 4pm this evening leaving the Arch at Washington Square and heading down to "Ground Zero," with stops en route at police and fire stations.

More coverage of 9/11 events in The New York Times.