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

Other days

mean girls

Mean Girls Day
ride the wind

Ride The Wind Day
lash

Lash Day
tulip

Tulip Day
slime

Slime Day
my little pony

My Little Pony Day
comfy

Comfy Day
boba

Boba Day
bubble bath

Bubble Bath Day
cuddle up

Cuddle Up Day