On September 21, 2002, the United Nations declared that day International Day of Peace, a time "devoted to commemorating and strengthening the ideals of peace both within and among all nations and peoples." This day would be observed by all nations committing to a global ceasefire and non-violence. Vigils, speeches, music and other activities mark the day in cities throughout the world.
There are many peace groups working on a national and local level. Families for Peaceful Tomorrows is a group of people who all lost a family member in the 9/11 tragedy. They have come together to work for peaceful solutions to terrorism.
On the local level, Michigan Peaceworks is a grassroots organization that was organized in response to 9/11 and has grown into a significant activist group working for changes in national policy.