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

Other days

camera

Camera Day
one

One Day
promposal

Promposal Day
boba

Boba Day
coffee

Coffee Day
blanket fort

Blanket Fort Day
get funky

Get Funky Day
lisp

Lisp Day
nae nae

Nae Nae Day
mean girls

Mean Girls Day