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

Other days

self care

Self Care Day
comfy

Comfy Day
bow tie

Bow Tie Day
unicorn

Unicorn Day
stress awareness

Stress Awareness Day
kale

Kale Day
frozen yogurt

Frozen Yogurt Day
first love

First Love Day
lisp

Lisp Day
polyamory

Polyamory Day