Answer : 1. "12 दिसंबर"
Explanation :

International Day of Neutrality, observed annually on 12 December, is a day designated by the United Nations to promote neutrality among countries around the world. The concept of neutrality in international relations implies refraining a state from participating in wars between other states, maintaining an attitude of impartiality towards belligerents, and recognition of this abstinence and impartiality by the belligerents. This day was officially declared by the United Nations General Assembly resolution in 2017.