I emailed them a couple of times, and they responded a few days ago, with a somewhat vague answer about plans being made for a treasure hunt and a nighttime band on Sat., the 3rd. All the RV spots are already taken. She said that they are finalizing plans and to watch for further details, I suppose that means on their website. I just checked it and there's nothing new.
I remember reading a thread on their website where someone complained about the Memorial Day treasure hunt, lakerats, because it was as you said: $15 over and one prize. But, as to July 3, I guess we'll have to wait to find out.
Foo
P.S. We probably will not be there on July 3, but possibly on Friday or Sunday. Is Friday a better day to dive there? (fewer checkout dives, etc?).