I arrived at my parent's house in SC at 7:45am and an hour later I was on the lake in a kayak. I saw these sailboats gathering at one end of the lake and paddled over to see what was going on. I never did figure it out but it seemed to involved a few dozen sailboats going around a couple of powerboats. And a very loud annoying buzzer that would go off every few minutes. I was quite happy to go to quieter waters after taking a few pictures.