This event seems to originate from protests by women against exploitation at the workplace. It was first declared as a non-working day in the former USSR to recognise the contribution of Soviet women in building, defending and strengthening the former Soviet Union. It continues to be observed as a holiday in many former socialist countries, among others.
To all women, including the women in my life, a BIG thank you ! Enjoy your day, Venusians! I cannot imagine what the Earth would be like without you !
I hope that you continue to fight for your rights and get them! You deserve to get what has been denied to you for millenia!