Oops, it doesn't look like 'get fat day' is a national day..

Other days

artists

Artists Day
brow

Brow Day
hannah

Hannah Day
offer

Offer Day
my little pony

My Little Pony Day
blanket fort

Blanket Fort Day
bow tie

Bow Tie Day
emoji

Emoji Day
eat what you want

Eat What You Want Day
one

One Day