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

Other days

hannah

Hannah Day
blanket fort

Blanket Fort Day
latina equal pay

Latina Equal Pay Day
offer

Offer Day
lash

Lash Day
kale

Kale Day
lisp

Lisp Day
cat girl

Cat Girl Day
nae nae

Nae Nae Day
first love

First Love Day