Great news – one hotel is already full but there is a second one available, right next door:

Sleep Inn & Suites
7821 Gateway Lane
Concord, N.C. 28027
Phone 704 979 8800

Price $50 per night – with tax total of $56.88

The original hotel is full other than a few smoking rooms – there may be cancelations, but just in case this is a hotel near the original one.