Oops, it doesn't look like 'leader in one day' is a national day..

Other days

blanket fort

Blanket Fort Day
believe

Believe Day
boy friend

Boy Friend Day
ruby

Ruby Day
girl friend

Girl Friend Day
ride the wind

Ride The Wind Day
brow

Brow Day
boba

Boba Day
lumpy rug

Lumpy Rug Day
camera

Camera Day