The Newport Guitar Festival is a gathering of guitar builders that first took place in 2004. Now they're planning a bigger and better festival to be held in August 2006!
The last show was more guitar show than conference or anything else. They did offer a few seminars, but really it's a way to see guitars, not to learn about them. It's a great way to see all kinds of small builders wares; though it was kind of noisey in the large room so it may or may not be the best way to hear a guitar.
Anyway, if you live near Newport Rhode Island, and are into accoustic guitars, then plan to go to this!