The Athenaeum is open until 8PM on Monday nights. Their gallery is having an exhibit called "Always Delightfully Cool: Summer Vacations in Northern New England 1825-1900." Anyone interested in going, sometime in the next couple of weeks? I've never been to the Athenaeum, but it's supposedly a fascinating place.
Info here.
(By the way, I wouldn't normally consider Hingham to be part of Northern New England.)