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

Other days

ponytail

Ponytail Day
hannah

Hannah Day
lisp

Lisp Day
my little pony

My Little Pony Day
ride the wind

Ride The Wind Day
one

One Day
lost sock memorial

Lost Sock Memorial Day
blanket fort

Blanket Fort Day
kale

Kale Day
slime

Slime Day