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

Other days

ponytail

Ponytail Day
coffee

Coffee Day
bubble bath

Bubble Bath Day
frozen yogurt

Frozen Yogurt Day
kale

Kale Day
gallery

Gallery Day
nae nae

Nae Nae Day
ride the wind

Ride The Wind Day
stud

Stud Day
self appreciation

Self Appreciation Day