How did the celebration of women day start?

International Women's Day originated in the early 20th century amid the rise of industrialization and the labor movement. The first official observance took place on February 28, 1909, organized by the Socialist Party of America in New York City. It gained international recognition in 1910 when Clara Zetkin proposed a global day for women at the Second International Socialist Women's Congress in Copenhagen. The day has since evolved into a celebration of women's achievements and a call for gender equality worldwide.