April 23rd is International Day of the Book. That is Saint George's Day. April 23rd (on different calendars) is the date of Shakespeare's and Cervantes' death in 1616.
I have mentioned this before, take a foto of one of your bookshelves and send it to people. On the Cleveland Heights side of Larchmere on the outside of a bookstore there is a mural of forty-nine books. Not actual books, notice gas meter above, and electrical condulet cover in the top half of the art deco book.