If you've got a lot of cash to drop for 23 hours at sea, you might consider the Sweden Rock Cruise. The cruise sails October 6th from Stockholm, Sweden, makes a stop in Finland and returns to Stockholm on the 7th. Anvil and a reunited Helix are confirmed for the cruise and four more band announcements are forthcoming. I'm not quite sure why the Sweden Rock Cruise is always just one night. Seems to me the cruise could easily be expanded to at least three nights, but I digress. I'm sure the event is fun regardless.
Book here if interested.