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

Other days

eat what you want

Eat What You Want Day
carpenters

Carpenters Day
nail polish

Nail Polish Day
kale

Kale Day
lumpy rug

Lumpy Rug Day
buddy

Buddy Day
comfy

Comfy Day
camera

Camera Day
tulip

Tulip Day
reading

Reading Day