I see no one has responded to this question all day, and I am curious of this time period as well. Public schools in my area (Naples/FM, Florida) start the 7th or 8th of August, but I am not sure how common this time period is for school starting!
You should be alright, but in light to moderate crowds. There will probally be many foriegn visitors, espically our friends from the UK, as school is out over there during August, to my understanding.
I don't know how many more people will be there. We will be there (August 18-26) and we booked prior to the Free Dining Plan went into affect. I wonder how many more people decided to booked after hearing about the Free Dining?