Is there a reason that the weekend of August 22 is not blocked out? I'm not complaining I'm just curious. Is it slower on this weekend?

More and more schools are starting to go back to school in mid to late August, so "peak" summer season is over, and Disney doesn't expect to get close to capacity.

But it seems that the park is busy every weekend, and that if the SoCal AP's are not blocked out, a lot of them will show up in August, since they have been blocked out since late June.