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

Other days

believe

Believe Day
tulip

Tulip Day
ruby

Ruby Day
self care

Self Care Day
boyfriend

Boyfriend Day
frozen yogurt

Frozen Yogurt Day
lash

Lash Day
buddy

Buddy Day
brow

Brow Day
latina equal pay

Latina Equal Pay Day