Loire Valley is preparing to celebrate the 500th anniversary of the death of Leonardo da Vinci. Marcel Duchamp coined a legendary art historical pun with 1919's 'L.H.O.O.Q, Mona Lisa With Moustache.' pic.twitter.com/fIXHwwJh65 — Saatchi Gallery (@saatchi_gallery) April 28, 2017 From January to December 2019, over 500 cultural events have been scheduled, including exhibits, performances, concerts…