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

Other days

brow

Brow Day
artists

Artists Day
polyamory

Polyamory Day
carpenters

Carpenters Day
hoodie

Hoodie Day
self care

Self Care Day
fiancee

Fiancee Day
boy friend

Boy Friend Day
nae nae

Nae Nae Day
first love

First Love Day