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

Other days

unicorn

Unicorn Day
nail polish

Nail Polish Day
gum

Gum Day
brow

Brow Day
frozen yogurt

Frozen Yogurt Day
boyfriend

Boyfriend Day
comfy

Comfy Day
offer

Offer Day
stress awareness

Stress Awareness Day
donate your hair

Donate Your Hair Day