Newburyport, MA, a two mile walk/bike/taxi from Plum Island is having a music festival from noon-7pm on 9/3. We were going to Bob Lobster anyway for lunch then found out about this.
The festival was totally packed, but a heck of a lot of fun. The best part of the trip is the airport dog "Alfie." You'll know why when you meet him. The people at the airport are super nice as well.