Oops, it doesn't look like 'watch mean girls day' is a national day..

Other days

brow

Brow Day
boba

Boba Day
carpenters

Carpenters Day
lumpy rug

Lumpy Rug Day
book

Book Day
get funky

Get Funky Day
gum

Gum Day
nae nae

Nae Nae Day
lost sock memorial

Lost Sock Memorial Day
martini

Martini Day