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In page Mother's Day:

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In 1917, demonstrations marking International Women's Day in Saint Petersburg on the last Sunday in February (which fell on 8 March on the Gregorian calendar) initiated the February Revolution. Following the October Revolution later that year, the Bolshevik Alexandra Kollontai persuaded Vladimir Lenin to make it an official holiday in the Soviet Union, and it was established, but was a working day until 1965.[citation needed]