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

Other days

ponytail

Ponytail Day
one

One Day
coffee

Coffee Day
china

China Day
ask out your crush

Ask Out Your Crush Day
get funky

Get Funky Day
kiss a brunette

Kiss A Brunette Day
self care

Self Care Day
cat girl

Cat Girl Day
reading

Reading Day