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

Other days

carpenters

Carpenters Day
unicorn

Unicorn Day
coffee

Coffee Day
martini

Martini Day
cursing

Cursing Day
self care

Self Care Day
boy friend

Boy Friend Day
ride the wind

Ride The Wind Day
bounce

Bounce Day
fiancee

Fiancee Day