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

Other days

azonto is acceptable

Azonto Is Acceptable Day
bow tie

Bow Tie Day
prescription drug take back

Prescription Drug Take Back Day
first love

First Love Day
boba

Boba Day
china

China Day
self appreciation

Self Appreciation Day
embarrass your best friend

Embarrass Your Best Friend Day
nae nae

Nae Nae Day
hannah

Hannah Day