We've gone t the end of August for the last 3 years and will be there 8/26-9/1 this year. We've also done trips in June, July, November (days leading up to Thanksgiving) and a Presidents Day weekend in February. Of all those trips the crowds have always seemed lightest at the end of August, but I wouldn't describe it anywhere near a 2-4. I feel like if you felt Spring Break was very doable, then you will really enjoy your end of August trip. It will probably be significantly warmer, though. Also, I agree that with all the new stuff for the 60th, who knows?