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

Other days

ruby

Ruby Day
ride the wind

Ride The Wind Day
comfy

Comfy Day
bow tie

Bow Tie Day
pick me

Pick Me Day
buddy

Buddy Day
bounce

Bounce Day
stud

Stud Day
promposal

Promposal Day
polyamory

Polyamory Day