There are lots of hotels to pick from either in the Clayton/Garner Area or in Raleigh closer to the airport.
Some options: (but there are many more and feel free to pick what you want!)
Hilton Garden Inn (Indoor Pool, Bar & Grill, Gym - 4 minutes from RDU airport) *Stayed here before and had a good experience.
Holiday Inn Express Clayton (Free breakfast, outdoor pool - 6 minutes from venue)
Hampton Inn Raleigh/Clayton (Free breakfast, outdoor pool - 8 minutes from venue)