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

Other days

ponytail

Ponytail Day
pumpkin

Pumpkin Day
pick me

Pick Me Day
coffee

Coffee Day
nae nae

Nae Nae Day
book

Book Day
ormille

Ormille Day
bow tie

Bow Tie Day
eat what you want

Eat What You Want Day
lumpy rug

Lumpy Rug Day