Sarah, glad to hear that you will be coming to Merlefest...you, LuAnna and I need to make to plans to meet up.
As for airports your best bets are Charlotte or Greensboro...the driving time is about the same between the two. Sounds like you and LuAnna might have something worked out in terms of getting there but should something go awry, let me know...I'm close to the Charlotte airport.
I am planning on going all 4 days but will be driving back and forth each day.
Listening to:
The Soft Parade - The Doors