Oops, it doesn't look like 'misandry day' is a national day..

Other days

martini

Martini Day
ponytail

Ponytail Day
me

Me Day
tell a fairytale

Tell A Fairytale Day
tulip

Tulip Day
youth

Youth Day
blanket fort

Blanket Fort Day
bow tie

Bow Tie Day
nae nae

Nae Nae Day
frozen yogurt

Frozen Yogurt Day