Oops, it doesn't look like 'single as fuck day' is a national day..

Other days

ponytail

Ponytail Day
one

One Day
bounce

Bounce Day
cat girl

Cat Girl Day
boy friend

Boy Friend Day
lumpy rug

Lumpy Rug Day
nae nae

Nae Nae Day
hoodie

Hoodie Day
my little pony

My Little Pony Day
law

Law Day