Oops, it doesn't look like 'jump into an airship with a questionable stranger and go have an adventure day' is a national day..

Other days

Eat What You Want Day

Polyamory Day

Me Day

Buddy Day

Self Appreciation Day

Camera Day

My Little Pony Day

Chocolate Milkshake Day

Tell Ur Crush You Like Them Day

Lumpy Rug Day