As you may or may not know, for those of you in Boston Proper, SoWa market Sunday's go on from May through October. Their last market of the season falls on Halloween and they're celebrating with costume contests, pumkin carving and live music. Go here to check out their official website http://www.southendopenmarket.com/
The New York Times says,
"This is Boston's version of London's Portobello market, with vintage clothes sellers and young fashion and jewelry designers rubbing elbows with artists and cheese makers and antiques dealers. What's exciting about this market is that it changes each week. So, some Sundays you'll discover a local artist who is there only that day. Everyone sells from tables beneath white tents."