Tom Sawyer's friend was Huckleberry Finn, who journeyed completely down the Mississippi (clearly the most important of the "Rivers of America" represented here) during the time when America was exploring the Frontier...
And the original "magic kingdom" at Disneyland has a New Orleans Square along the banks of this river.
So, going back to the thread topic, I believe that this promotion would be a good fit with the riverboat, but even more so in Disneyland.
Check out the Satchmo footage from "Disneyland After Dark":
http://www.youtube.com/watch?v=bKkj1P3cIEI
It was part of a great special from 1962 wherein Walt shows you some of the cool things they did then, including parties and music. So, having authentic New Orleans music and other special events is not new, but would definitely be welcome.
(The whole special is part of the Disneyland DVD in the Walt Disney Treasures series, and is worth watching. Walt's personal intro is found here:
http://www.youtube.com/watch?v=dLPILfpK3K8 .)
Paul