In 1975, during International Women's Year, the United Nations began celebrating 8 March as International Women's Day. Two years later, in December 1977, the General Assembly adopted a resolution proclaiming a United Nations Day for Women's Rights and International Peace to be observed on any day of the year by Member States, in accordance with their historical and national traditions.
This year’s theme for International Women’s Day is: “A promise is a promise: Time for action to end violence against women”
From China to Costa Rica, from Mali to Malaysia acclaimed singers and musicians, women and men, have come together to spread a message of unity and solidarity: We are "One Woman". (Source UN Women)