From what I saw most stayed the week. A few pulled out on Friday instead of Saturday, but that wasn't the majority. Surprisingly though, hookup and pull out on Saturday went pretty smooth. I never really noticed any lineups of people waiting to get out.
As far as post rally trips, I know our neighbours (Boots49) said they were going with some other people into the Wisconsin Dells after the rally. We had to work so we couldn't avail ourselves of offer from them to join in, but it does go to show that some do happen.
There's no use crying over spilled milk, unless it's on your keyboard.