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

Other days

frozen yogurt

Frozen Yogurt Day
ponytail

Ponytail Day
ride the wind

Ride The Wind Day
ruby

Ruby Day
brow

Brow Day
bubble bath

Bubble Bath Day
bounce

Bounce Day
tulip

Tulip Day
hoodie

Hoodie Day
lumpy rug

Lumpy Rug Day