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

Other days

boba

Boba Day
hiv awareness

Hiv Awareness Day
nae nae

Nae Nae Day
nail polish

Nail Polish Day
lisp

Lisp Day
pick me

Pick Me Day
artists

Artists Day
slime

Slime Day
ponytail

Ponytail Day
gum

Gum Day