The question of Palestine was brought before the United Nations shortly after the end of the Second World War. The origins of the Palestine problem as an international issue, however, lie in events occurring towards the end of the First World War. In 1947 the United Nations accepted the responsibility of finding a just solution for the Palestine issue, and still grapples with this task today.
International days are occasions to educate the public on issues of concern, to mobilize political will and resources to address global problems, and to celebrate and reinforce achievements of humanity. The existence of international days predates the establishment of the United Nations, but the UN has embraced them as a powerful advocacy tool. More information available here.