For the 6th year, the small town of Burnsville opens its doors to more than thirty authors and hundreds of book lovers during the Carolina Mountains Literary Festival.  Held this September  9 and 10, the festival features evening events for its featured authors Ron Rash and Audrey Niffenegger. Though she is known for her novels The Time Traveler’s Wife and Her Fearful Symmetry, Niffeneger is also…