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

Other days

china

China Day
singles

Singles Day
self care

Self Care Day
first love

First Love Day
cat girl

Cat Girl Day
lisp

Lisp Day
cuddle up

Cuddle Up Day
brow

Brow Day
kale

Kale Day
lumpy rug

Lumpy Rug Day