The event will take place at the E-Center at the Esplanade, which sits on Camelback across from the Biltmore Fashion Center. You reach the parking garage by pulling around the back of the building on E. Esplanade Lane. Take a parking ticket and bring it with you; you will get a validated and paid ticket that you can use, along with the one you get when you enter, to exit the garage. Note that the E-Center sits next to the main office buildings at street level.
This map and entrance photo should help, but you can also access it on Google . . .