Which city hosted the 1910 conference that approved a Women's Day idea?

The 1910 conference that approved a Women's Day idea was held in Copenhagen.

The meeting was the Second International Socialist Women's Conference, held in Copenhagen, Denmark, on 26–27 August 1910. German socialist activist Clara Zetkin and other delegates proposed an annual international day focused on women's rights, especially women's suffrage. The roughly 100 delegates represented 17 countries and agreed to support the idea, although they did not choose a specific date at that time.

The conference was connected with the wider 1910 congress of the Socialist Second International. Its resolution drew partly on “Woman's Day” activism in the United States, including an event organized in New York in 1909. The first large European observances followed in 1911, when demonstrations took place in Austria-Hungary, Denmark, Germany and Switzerland.

Copenhagen is sometimes confused with later milestones. The city did not establish 8 March as the permanent date, and the United Nations did not adopt its official observance until decades later. The date became associated with revolutionary events in Russia and was later internationally consolidated.