1) September 22
2) September 23
3) September 26
4) September 24
Explanation:
The annual event of International Day for the total elimination of nuclear weapons was observed on September 26, 2019. The day creates public awareness of nuclear disarmament matters, educates people on the potential threat by nuclear weapons and stresses the need for their elimination. It was declared by the United Nations General Assembly (UNGA) in 2013 and was first celebrated in 2014.