Nantucket has a problem. It’s called popularity. It’s become so loved and revered that most of June, all of July and August ,and half of September have become so crammed with humanity that the Nantucket Chamber of Commerce decided to try to convince some visitors that the off-season is a good idea. Or to leave their car on the mainland. Or to enjoy the free things the island has to offer. SAND helped with the able skills of Dan Driscoll at September Productions.