OK after much googling I think the 4:00pm PDT webcast on Dec 5 will be at 1:00pm Sunday Dec 6 for we Aussies on the east coast. Although webby does say they are streaming some of the DVD first from 3:30pm PDT so that will be 12:30pm EST here in Oz (east).
Seems like there might be some chat too, so Aussies get on it! At least we can participate in the chat.
Good luck to the contestants, who wouldn't love to have that guitar?