I haven't heard them recently, but I know many very good players (often Boston/New York guys) who do gigs with the band. I think they try to maintain a high standard and select good players, so I expect it won't be a "burned-out nostalgia band" experience. All you need beyond good players is a good book, and the Artie Shaw book is a good one. There are always unforseen variables, so there is always a chance I could be wrong, but I think it would be worth checking out.
It could be a "NUTTY" night! I predict you'll thoroughly enjoy yourself. At the very least your wife should earn some "hipness" credits!
Let us know how it turns out!