If you’re looking for something fun (and free!) to do this weekend, go check out Boston GreenFest 2009 at City Hall Plaza, right outside the Government Center T stop. This event runs from 10 AM to 10 PM August 21st and 22nd with a kickoff concert tonight from 5 to 10. Over the next two days there will be screenings of the films “The Greening of Southie”, “Fresh”, “Out of Balance: ExxonMobil’s Impact on Climate Change”, and “Flow: The Film”. There will be speakers and workshops covering everything from green cars to eco-games to the Charles River. You can also walk around and check out the art gallery, exhibits and listen to some live music. This looks like a really fun event with something for everyone. I’m planning to attend on Saturday so maybe I’ll see you there.