Green Festival Back In Chicago, May 18th & 19th May 8, 2013 Where are all my eco-friendlies at?! Sammi, here to talk nothing other than the Green Festival coming to our beautiful windy city on May 18th & 19th at Navy Pier. Let’s kick off this spring weather with one the largest (24,000 participants in 2012) and most diverse festivals including education, shopping, food and loads of fun activities!