Used to do this a lot in Seattle area
20 to 30 boats at a time and then party. We used to do a line of boats and sometimes a complete circle. It requires some careful consideration as to alignment of masts, who puts out an anchor, what the currents and waves are expected to do, etc. If there is a party with a lot of drinking and idiotic behavior, captains need to tend to their own boats. I was once in a raft up and when I came up on deck, the visiting "landlubber crew" on the neighboring boats had untied from the raft and were leaving. The only problem was that my boat was adrift.