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

Other days

tulip

Tulip Day
bow tie

Bow Tie Day
eat what you want

Eat What You Want Day
pick me

Pick Me Day
cursing

Cursing Day
one

One Day
pumpkin

Pumpkin Day
gallery

Gallery Day
blanket fort

Blanket Fort Day
lumpy rug

Lumpy Rug Day