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

Other days

stud

Stud Day
nae nae

Nae Nae Day
blanket fort

Blanket Fort Day
self care

Self Care Day
camera

Camera Day
comfy

Comfy Day
slime

Slime Day
bow tie

Bow Tie Day
donate your hair

Donate Your Hair Day
lash

Lash Day