First of all, you're technically in the wrong subforum-- if you're looking to find cosplay friends in a regional area or form a group, you want the Seeking Cosplayers subforum. This is a forum for discussing cosplays from a series regardless of geography, so you should have better luck there.
As someone who is also pretty familiar with the Boston cosplay scene, I'd also recommend checking Facebook. There are groups like "Boston Cosplay Hobos" for general cosplay nonsense as well as convention-specific groups (eg for Anime Boston, PAX East, Boston Comic Con, etc.) that might be worth your while to post in.
Best of luck!
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