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The town hall of whatever town the park is in. For Wellesley, it was the natural resources commission. You may need to go through the directory, and find what looks closest to land conservation, or some kind of property management - if you've got the wrong place, they should know what department to transfer you to.

If the park is managed (like Trustees of the Reservation), then you should contact the park management. Dog friendliness can usually be determined by taking a walk around the park on a nice afternoon. If you see a lot of dogs, especially off leash, its probably not a great place for a pignic. (The Wellesley town hall bowl has geese and ducks in the area, so they ask to keep dogs to a minimum, and generally people won't bring their dogs there.) Park management may know of a quiet corner of the place, too, that might be best to hold a pignic.

If the park has any on-line presence, they will sometimes post their pesticide policies, which helps.

Many areas, if there is heavy kid/toddler traffic, will have a pesticide-free policy.

It can be hard making the first call, but I've generally found people helpful and at least somewhat entertained by the idea. You should be able to get some direction after that.