Oops, it doesn't look like 'turn into a potato day' is a national day..

Other days

reading

Reading Day
stud

Stud Day
boy friend

Boy Friend Day
girl friend

Girl Friend Day
china

China Day
self care

Self Care Day
unicorn

Unicorn Day
book

Book Day
lumpy rug

Lumpy Rug Day
polyamory

Polyamory Day