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

Other days

pampering

Pampering Day
stud

Stud Day
healing

Healing Day
bow tie

Bow Tie Day
self appreciation

Self Appreciation Day
cat girl

Cat Girl Day
kiss a brunette

Kiss A Brunette Day
hannah

Hannah Day
nae nae

Nae Nae Day
brow

Brow Day