Two spots to go to:
Stuffed Potato from (I think) Holy Potatoes. Run by a local Catholic church - excellent potatoes and toppings.
Clam Fritters and Rhode Island style chowder from Kenyon Corn Meal Company (or Kenyon Mills). They are from Rhode Island - grind all their own grains on an old grist mill. If you stop at this stand - see if Paul is working and tell him Vinnie and Kelley say hi - we're friends from college.
Enjoy the fair!