I recently learned about the Somerville ArtBeat festival. Sadly, it was about a month after applications for craft vendors had passed. So unless another vendor pulls out in the next few days (maybe they'll be too busy devouring the very last Harry Potter book) I'll be there as a visitor only, and encourage all the local yokels out there to come check it out as well (that is, if you're not too busy reading HP7).
Support your local wizard... I mean, crafter.