International Women's Day (8 March) is an occasion marked by women's groups around the world. This date is also commemorated at the United Nations and is designated in many countries as a national holiday. When women on all continents, often divided by national boundaries and by ethnic, linguistic, cultural, economic and political differences, come together to celebrate their Day, they can look back to a tradition that represents at least nine decades of struggle for equality, justice, peace and development.
International Women's Day is the story of ordinary women as makers of history; it is rooted in the centuries-old struggle of women to participate in society on an equal footing with men. In ancient Greece, Lysistrata initiated a sexual strike against men in order to end war; during the French Revolution, Parisian women calling for "liberty, equality, fraternity" marched on Versailles to demand women's suffrage.
Content taken from http://www.un.org/.