Oops, it doesn't look like 'lie about crowd size day' is a national day..

Other days

slime

Slime Day
comfy

Comfy Day
one

One Day
cursing

Cursing Day
nail polish

Nail Polish Day
lumpy rug

Lumpy Rug Day
ride the wind

Ride The Wind Day
get funky

Get Funky Day
buddy

Buddy Day
cat girl

Cat Girl Day