For a group of 20 I'd ditto what Chris said. Victoria House might worth a toss too. There are several options in that area south, even if you had to split up for lodging. I think you're going to be right in the middle of the Jerry Jeff Walker thing which could present a very large problem finding a block of accomodations. I'd get workin' on it now and keep posted.
You'll have a great time...January is our favorite month for AC.