World Humanitarian Day is a day dedicated to recognize humanitarian personnel and those who have lost their lives working for humanitarian causes. It was designated by the United Nations General Assembly as part of a Swedish-sponsored GA Resolution A/63/L.49 on the Strengthening of the Coordination of Emergency Assistance of the United Nations, and set as 19 August. It marks the day on which the then Special Representative of the Secretary-General to Iraq, Sérgio Vieira de Mello and 21 of his colleagues were killed in the bombing of the UN Headquarters in Baghdad.
History
The designation of 19 August as World Humanitarian Day is the outcome of the relentless efforts of the Sérgio Vieira de Mello Foundation and his family working closely with the Ambassadors of France, Switzerland, Japan and Brazil in both Geneva and New York to table and steer the draft Resolution through the General Assembly. The Foundation conveyed its deep gratitude to the United Nations General Assembly and all Member States for the worthy gesture of recognition that has ensured that the tragic loss of Vieira de Mello and his 21 colleagues and all humanitarian personnel who have made the ultimate sacrifices in relieving the suffering of victims of humanitarian crises have not been in vain.
For more: http://en.wikipedia.org/wiki/World_Humanitarian_Day
World Humanitarian Day (WHD) is held every year on 19 August to pay tribute to aid workers who risk their lives in humanitarian service, and to mobilize people to advocate for a more humane world.
This year, WHD follows on one of the most pivotal moments in the history of humanitarian action: the World Humanitarian Summit, held from 23 to 24 May in Istanbul. During the Summit, world leaders came together to declare their collective support for the new Agenda for Humanity and commit to bold action to reduce suffering and deliver better for the millions of people in need of humanitarian assistance.
For more: http://www.unocha.org/whd2016
Video: https://youtu.be/o1–l9VjUbk
Reblogged: ProPresident Obama
While you were sleeping 
ah I totally missed it this year. Bummer