Oops, it doesn't look like 'Building Museum All day' is a national day..

Other days

ride the wind

Ride The Wind Day
youth

Youth Day
me

Me Day
gum

Gum Day
one

One Day
cuddle up

Cuddle Up Day
hot chocolate

Hot Chocolate Day
eat what you want

Eat What You Want Day
ruby

Ruby Day
bow tie

Bow Tie Day