Lightfoot has, true to form, always been very modest about the donation of his time to a multitude of causes. Where some public persons have a tendancy to "milk" their appearances at benefits for all of the publicity they can generate, Lightfoot continues to do his work in a very low profile way.
Although it was not a benefit concert, Lightfoot donated $10,000 to help build an arena in Superior, Wisconsin several years ago. And there's no telling how many other donations are made by him that never get reported.