Ladies' Day

noun (often lowercase)

a special day set aside, either occasionally or regularly, on which women are encouraged to attend or participate in a certain activity at a reduced fee or at no cost: Friday was Ladies' Day at the ball park.
a special day on which women are invited or allowed to attend a club meeting or other activity usually restricted to males.

Origin of Ladies' Day

An Americanism dating back to 1780–90 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019