This weekend is the annual Boston Ähts Festival. The event takes place this Friday, Saturday and Sunday in Christopher Columbus Park. (Just plug in 105 Atlantic Ave., Boston, MA into google maps.)
I haven't been before, but their website looks pretty cool. Their acts range from indie folk rock to ballet to New Orleans R&B. There'll be visual art from glassblowing to ceramics to metalworking with a lot of hands-on demonstrations. I'll definitely checking it out in between the Greek Festivals. (Somerville and Brookline)
And that's not all Boston is doing to celebrate the Ahts. Check out the Public Art Boston website they've got a great map you can download with all the public art like old statues, murals and modern installations. Lastly, another great resource is the Boston Open Studios Coalition - there's a lot! Though of course my favorite, of course, is JP Open Studios. It's totally homey and has lots of great snacks. It's September 25th -26th, so mark your calendars and I'll see you there.