Must be a rowdier bunch of boaters down in the lower Magothy than up here in the frozen northern reaches of Chesapeake Bay. We have a couple, similar raft-ups every weekend of the summer, mostly powerboats, and a few sailboats. One bunch spends the day at what is known as The Sand Island, located near the southern end of the Havre de Grace channel across from Fishing Battery Island. Usually, there's about 40 to 60 boats there, lots of drinking and swimming, but no fights that I know of. Labor Day weekend usually sees about 100 boats a day there, a live band or two on the island, some bonfires, and lots of booze.
The second raft-up usually takes place at the northern end of the Susquehanna Flats near the VA Hospital. Lots of jet skis, lots of smaller boats, some sailboats to 30 feet, lots of skinny dippers late evenings, and probably enough booze to float the QE2. Once in a while you might see a floating beer can or two, but that's pretty rare. No fights here either, but lots of lovin' when the sun goes down. There have been a few bands there on party-barges, but when the sun goes down the bugs take over and the party usually ends.
The loudest music I've encountered usually comes from onshore locations. Gibson Island's beach house out on the point can get pretty loud when they have summer, weekend parties. Same holds true for the Tiki Bars along the bay. They're jamming till 2 or 3 in the morning in Fairlee Creek and the volume is usually somewhere in the vicinity of ear bleed--not a good place to anchor up on summer weekends.
As for isolated locations to hold Bumper Bash, not many on the bay's western shore until you get above Carol Island. From there north is nearly all federal property. As long as you stay out of the restricted area you can party-hearty and no one would be bothered. Of course, you may have to put up with an occasional artillery shell passing overhead and exploding along the beaches of Spesutia Island. Hmmmm! Bet that might add some excitement if you were not anticipating the shelling.
There's lots of incredible mansions along the Eastern Shore, and I would venture a guess that nobody there would be happy if there was a raft-up taking place within eyesight or earshot of them. South of the Bay Bridges, however, there's a brand-new island that was just created by DNR--Poplar Island. Nobody there but some sea gulls, lots of skeeters, gnats and a few other critters. I'd bet DNR would be more than happy if Bumper Bash were to take place there and someone was designated to remove the drunks and trash at the end of the fest.
Just another fun day in Paradise!