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

Other days

lash

Lash Day
nail polish

Nail Polish Day
slime

Slime Day
offer

Offer Day
bow tie

Bow Tie Day
coffee

Coffee Day
hiv awareness

Hiv Awareness Day
unicorn

Unicorn Day
stress awareness

Stress Awareness Day
martini

Martini Day