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

Other days

bow tie

Bow Tie Day
self appreciation

Self Appreciation Day
stress awareness

Stress Awareness Day
lash

Lash Day
law

Law Day
nail polish

Nail Polish Day
bubble bath

Bubble Bath Day
self care

Self Care Day
offer

Offer Day
stud

Stud Day