Maybe you are referring to the week blockouts lifted? Because we went the last week that year and it was great. The trick is making sure you go the week AFTER blockouts lift. They used to lift blockouts earlier in August which has changed the dynamic for the late part of that month.
Monday, August 29th would be a great day to start your vacation as it is the week after blockout lift AND most all southern california schools are back in session. Park hours may be a bit reduced, like an 11:00 close instead of midnight. It's the best time to go in the summer IMHO.
Tracy