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

Other days

boyfriend

Boyfriend Day
cursing

Cursing Day
slime

Slime Day
eat what you want

Eat What You Want Day
self care

Self Care Day
cat girl

Cat Girl Day
gum

Gum Day
kiss a ginger

Kiss A Ginger Day
comfy

Comfy Day
camera

Camera Day