Oops, it doesn't look like 'no showering day' is a national day..

Other days

ask out your crush

Ask Out Your Crush Day
singles

Singles Day
lumpy rug

Lumpy Rug Day
lash

Lash Day
hiv awareness

Hiv Awareness Day
healing

Healing Day
comfy

Comfy Day
one

One Day
bow tie

Bow Tie Day
buddy

Buddy Day