Check out some of the freshest innovations in eco-friendly design, fashion, food, drink and technology at the annual Green Festival May 18-19 at Navy Pier. Running from 10 a.m. to 6 p.m. Saturday and from 11 a.m. to 5 p.m. Sunday, tickets are $10 daily or $20 for a weekend pass, both of which include $5 in "Green Fest Bucks" to spend at the event.