Satinwood.
www.satinwood.net
Th band is headed by Paul and Melanie Motter. They do concerts to raise money for for "worthwhile organizations leading the fight against hunger and poverty (and other causes) in the tradition of Harry Chapin". They perform fully arranged versions of songs by Harry Chapin, Jim Croce, and Gordon Lightfoot, as well as several others.
I first emailed with Paul many years ago, when he was thinking of doing his first Lightfoot tribute. Now it's part of the tradition.
I'm not certain that they did their first tribute before you did, however, although they were thinking about it. I'll have to look back in my mail and see!
Jenney and I (and John) attended one concert in Hartford two or three years ago. It was great.