The A2ZERO Green Fair, a free sustainability event along Ann Arbor’s Main Street, will take place this Friday, Sept. 20, from 5-8 p.m. Main Street will be activated with exhibitors offering various resources, creative and interactive demonstrations, education, live music, and games. Attendees will have the opportunity to stroll the exhibits and learn about innovative ways to live sustainably – as well as interact with visiting residents of Ann Arbor’s German sister city.