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

Other days

prosecco

Prosecco Day
bounce

Bounce Day
ask out your crush

Ask Out Your Crush Day
nae nae

Nae Nae Day
pampering

Pampering Day
one

One Day
martini

Martini Day
promposal

Promposal Day
blanket fort

Blanket Fort Day
stud

Stud Day