Cost: Free

What to expect: Head to Lincoln Park (Clark and Armitage) to celebrate the first-ever Carbon Day in Illinois - there'll be food, live music (including The Giving Tree Band) and plenty of eco-activities like tree planting, composting and recycling. You'll also have the chance to view the latest green technology.

Additional info: If you're really curious to see what'll be happening at the fest (or you just want to support), check out the Green Carpet Gala preview event at District Bar on Thursday, August 20. Organic cocktails, food and green technology are among the highlights. Win tickets here!