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

Other days

china

China Day
lumpy rug

Lumpy Rug Day
believe

Believe Day
unicorn

Unicorn Day
pumpkin

Pumpkin Day
camera

Camera Day
tell ur crush you like them

Tell Ur Crush You Like Them Day
bow tie

Bow Tie Day
coffee

Coffee Day
ruby

Ruby Day