There are many attractions and things to enjoy your bits of free time in Concord - or extend your stay!

Activities 

Golf at Rocky River Golf Club - a Tuesday late afternoon, pre-conference outing might be perfect for you and a group of colleagues. Contact Johnathan Grab at 704-455-1200 ext. 21, let them know you are an NCCDA/PHRANC conference attendee and make arrangements at least one week prior. 
Spa - Looking for some pampering, check out the nearby Spa Botanica. Price list is here. 
Charlotte Motor Speedway is right down the road and there is a race the weekend after the conference. 
Concord Mills Mall is a short drive from the hotel. 

& so much more - visit Cabarrus County Convention & Visitors Bureau.