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

Other days

tulip

Tulip Day
boba

Boba Day
bubble bath

Bubble Bath Day
pick me

Pick Me Day
cat girl

Cat Girl Day
lumpy rug

Lumpy Rug Day
girl friend

Girl Friend Day
ponytail

Ponytail Day
buddy

Buddy Day
bounce

Bounce Day