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

Other days

ruby

Ruby Day
cursing

Cursing Day
law

Law Day
hiv awareness

Hiv Awareness Day
singles

Singles Day
lumpy rug

Lumpy Rug Day
one

One Day
bounce

Bounce Day
eat what you want

Eat What You Want Day
tulip

Tulip Day