Received this note in La Cuisine's (Paris cooking school) newsletter.
Originally created by Pierre Hermé, [3/20] is the day to enjoy Macarons galore for a good cause. In France [and in a few shops in other countries], participating shops give a macaron in exchange for any small donation to a Cystic Fibrosis Organization.
http://www.jourdumacaron.com/adresses.html
participating shops in Paris include Pierre Hermé (our favorite), Jean-Paul Hévin, and Sadaharu Aoki, among others