1) August 19
2) August 17
3) August 18
4) August 16
Explanation:
The world humanitarian day (WHD) 2019 was observed on August 19, 2019. The day was observed to pay tribute to aid workers who risk their lives for humanitarian services. The Campaign for the 2019 World Humanitarian Day is ‘Women Humanitarians’. It aims to draw attention towards the work of women in crises throughout the world.