There are no rules
Typically people float from boat to boat, but often end up congregating in the cockpit of the largest boat.
Bring a swimsuit and a towel for pre cocktail hour. The weather forcast looks perfect!
We're planning on going down to the West River tomorrow (Friday) and tying up at the Pirate's Cove in Galesville if they have room. Otherwise, we'll anchor out.
I believe Bob Morrow is anchoring out up on the Rhode River Friday.
