Civil Society held the largest international peace conference in history on May 11-15, 1999, the centenary of the First Hague Peace Conference in The Hague, Netherlands. Nearly 10,000 people from over 100 countries gathered in The Hague's Congress Center in response to an appeal launched by the International Peace Bureau (IPB), the International Physicians for the Prevention of Nuclear War (IPPNW), the International Association of Lawyers Against Nuclear Arms (IALANA), and the World Federalist Movement (WFM). During the five-day gathering, participants discussed and debated - in over 400 panels and workshops - mechanisms for abolishing war and creating a culture of peace in the 21st century.
The project was led by an Organizing Committee made up of roughly 30 international organizations. The purpose of The Hague Appeal for Peace 1999 was to raise in a serious and realistic way, questions as to whether or not at the end of the bloodiest century in history, " humanity can find a way to solve its problems without resorting to arms, and is war still necessary or legitimate given the nature of weapons currently in arsenals and on drawing boards worldwide, and can civilization survive another major war?"