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

Other days

bonang

Bonang Day
first love

First Love Day
china

China Day
mean girls

Mean Girls Day
comfy

Comfy Day
pick me

Pick Me Day
tulip

Tulip Day
bounce

Bounce Day
nae nae

Nae Nae Day
ponytail

Ponytail Day