Boston Herald or Globe has an annual supplement with an exhaustive list of ethnic festivals in the area. Worth at least 3 straight days of googling.
Does anyone know the details and when does it come out? I got it the last 2-3 years, but haven't noticed it yet this year. As a result, I've missed 90% of the festivals so far this summer!
A few (mostly Greek) get mentioned here, but I see that you're not into Albanian, Jamacain, Hebrew, or the many other weird chowfests their supplement covers.