I didn't cancel my extra hotel room (Doubletree Hotel Madison) in time and was hoping that someone was looking for a room. The rate is $279 per night arriving on Sept 9 departing Sept 14. King Bed, Non Smoking with Breakfast.
I'm not sure if there is a penalty for changing the arrival or departure date but I can call to find out.
Please email me (click on my username) if you're interested.