From the website, Making Peace.org:
Making Peace is a major public (indoor/outdoor) event that aims to teach the public, especially young people what key elements are necessary to create a 'sustainable peace'; providing an opportunity for people of all ages to get involved in bringing about positive change. Activities include a large outdoor photographic exhibition curated by Ashley Woods (formerly with Magnum Photos) that pays tribute to the people who — all over the planet — devote their time, energy and resources to the cause of peace.
Making Peace was first produced to mark the centenary of the Nobel Peace Prize awarded to the International Peace Bureau (IPB) in 1910.
While there are many meanings and definitions of peace, the IPB believes that there are five main elements that go together to form peace, and that they can be represented by five colours. Only by bringing these five elements together can we create a sustainable peace.