International Women's Day is on March 8th. However, there is nothing International about it. Most of the world does not know it exists.
All women are getting flowers and gifts, including at work. The husbands (boyfriends) suppose to wine and dine their woman. She should do nothing all they, she is a queen for the day.
It was kind of fun.. At least, that's how it used to be...long time ago

So, if you have a polish wife or a girlfriend - remember this date. She will be very surprised and very pleased.