I don't own a Gibson pre-war banjo and I've never been to this event. But man does it look like fun. Have people been checking out the youtube clips from Banjothon 2012? Dave Hedrick and some others have done a great job getting video clips of the various players on many of the banjos at the event.
A couple of my favorites...
Brandon Henson on 312-8 in D tuning (I'm always a sucker for these clips in D tuning)
Greg Ernest on Jim Mill's Mack Crowe
For other clips just do a youtube search for banjothon 2012