UN International Day of Peace Celebration (“the Celebration”) was successfully held in Sai Kung District of Hong Kong on 21 September 2019. The Celebration was organized by Hong Kong Institute of Education for Sustainable Development, sponsored by Utahloy charitable foundation, and supported by Sai Kung District Rural Committee, Sai Kung District Community Centre, Sai Kung Sung Tsun Catholic School, Utahloy International Schools, St. Bonaventure Catholic Primary School and Little Ark Education Company. More than 100 guests and 100 students attended the Celebration. Prof. Tao Xiping, Honorary President of World Federation of UNESCO Clubs, Centres and Association expressed his congratulatory message to the Celebration. Prof. Tao indicated that Peace is the everlasting expectation of all people. Peace is like air and the sun. People enjoy the benefits without knowing. But we cannot survive if we lose it. Without peace, there will be no development.