After going to last year's market site twice and finding nobody I sent an email to one of the people in charge of the Dewey Sq farmer's market . Here is his response:
Hi, thanks for your interest. We are unable to offer the Dewey Square market this year due to continuing logistical issues regarding loading/unloading and police detail costs. Instead, we'll be focusing our efforts on finding a location for a year-round market.
I'll have to get my When Pigs Fly fix somewhere else.