Wyndham Garden Hotel - Dayton Mall is the official "Event" hotel.
As you have noticed, the event hotel has changed it's brand to a Wyndham Garden Hotel. The hotel is going through a renovation, with the front desk, restaurant, pool area, banquet rooms and some of the hotel rooms finished. See pictures below.
They can be reached at: (937) 434-8030, FAX (937) 434-6452.
When you call, mention that you are coming to the Dayton Disneyana Event and you will be able to get the special rate, which is $81 a night. Rates are available for Thursday - June 27th, Friday - June 28th, Saturday - June 29th and Sunday - June 30th. To get this rate, reservations must be made by June 11th, 2013.
A word of caution here...due to the renovation of the hotel, the number of rooms have been reduced, so if you are thinking about staying overnight, I would strongly suggest making your reservations as soon as possible.
The area does have a number of offerings you may want to check out as well: the National United States Air Force Museum, which has a Disney Pins on Wings exhibit, The Dayton Art Institute, the Carrilon Historical Park, the Aviation Trail and the Kings Island Amusement Park about 30 mins. south, just to name a few.