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

Other days

one

One Day
bubble bath

Bubble Bath Day
lumpy rug

Lumpy Rug Day
bow tie

Bow Tie Day
buddy

Buddy Day
self appreciation

Self Appreciation Day
bonang

Bonang Day
ormille

Ormille Day
stud

Stud Day
hoodie

Hoodie Day