Navy Pier is always an exciting place, but for one weekend in May it’ll be the site of the Chicago Green Festival, the nation’s largest and most dynamic sustainability event. You’ll have the chance to hear from leaders in the social justice and environmental community, including speakers, entrepreneurs and activists such as former CNBC host Dylan Ratigan, Marianne Williamson, Emmanuel Pratt, Danny Seo, Democracy Now! host Amy Goodman, Greg Palast and John Perkins. There’s also an organic beer and wine garden featuring exclusive performances from local DJs, as well as yoga classes, cooking demos, a bike-repair workshop, art installations, a unique marketplace featuring the latest and greatest in sustainable products and services and much more. Bring the kids too, and they can get in on the act in the Green Kids Zone.  There’s so much to see and do that you’ll want to go both days (May 18 & 19) — your free ticket is good for the entire weekend!  The service fee (there’s always a service fee) on this deal is $4.75.