One of the many commemorations planned in memory of the dead on September 11 is the Rolling Requiem
The Rolling Requiem is a worldwide concert to honor those lost and those who helped others on September 11, 2001. While this terrorist tragedy took place in three United States locations, people from all over the world were affected. The goal of the Rolling Requiem is to have choirs performing in each time zone around the globe, beginning at 8:46 AM, the moment of the first attack With choirs in each time zone performing, continuous signing, or Rolling Requiem, will be heard throughout a 24-hour period.
A list of participating localities is now available, with more specific concert information forthcoming, I believe.