Oops, it doesn't look like 'send your favorite tweeter booty pics day' is a national day..

Other days

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
bubble bath

Bubble Bath Day
buddy

Buddy Day
believe

Believe Day
nae nae

Nae Nae Day
boy friend

Boy Friend Day
kiss a brunette

Kiss A Brunette Day
embarrass your best friend

Embarrass Your Best Friend Day
latina equal pay

Latina Equal Pay Day
bow tie

Bow Tie Day