ATHENS, June 22, 2016 (Xinhua) -- Refugee children and Greek youth participate in Olympic sports outside Zappeion exhibition hall in Athens, Greece on June 22, 2016. The Hellenic Olympic Academy in cooperation with UNHCR organized a run event for the Olympic Day, which falls on June 23 and the World Refugee Day, which falls on June 20. (Xinhua/Marios Lolos)