Yes you do need to call, usually they are in the fall or spring it's really cold in the winter. Fun times, we do it with our Scouts every year.
Battleship Cove is a museum. But I've heard of class trips and stuff like that can be arranged for sleepovers on the USS Massachusetts Battleship. You'll have to call museum office go details.
Looks like you have to call the office to check the schedule. It's called Nautical nights. Typically it's during the weekends for scouts.
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