Oops, it doesn't look like 'no pantie day' is a national day..

Other days

fiancee

Fiancee Day
frozen yogurt

Frozen Yogurt Day
boyfriend

Boyfriend Day
nae nae

Nae Nae Day
gum

Gum Day
law

Law Day
lumpy rug

Lumpy Rug Day
ponytail

Ponytail Day
pick me

Pick Me Day
lash

Lash Day