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

Other days

bonang

Bonang Day
lisp

Lisp Day
bow tie

Bow Tie Day
ponytail

Ponytail Day
aloxolt

Aloxolt Day
boba

Boba Day
buddy

Buddy Day
nae nae

Nae Nae Day
tell a fairytale

Tell A Fairytale Day
artists

Artists Day