There is a very large blues festival in a field south of Greenville in September, I don't have the name with me right now, that might be an ideal target. AGAIN, they REALLY need to get Steve Cheseborough's book "Blues Traveling", it is the ONLY place they are going to get a clue about music in the Delta, it can be very difficult to find between festivals.

In fact, the slick thing to do might be to get festival listings for all the states (use the state tourism websites) and plot your course from festival to festival.

A lot of 'indigenous' music in the south is gospel and church music so they may want to inquire about 'gospel singings' which are intense gospel concerts, either search online, or go by word of mouth when they hit the ground. Many are still advertised only the old timey way, with cards in store windows.

In Jackson, you want to get listings for whoever Hal & Mal's and Fenian's is presenting, and also consult the Jackson Free Press online, I think it's called the Lounge List, because blues venues have been shifting around lately. If they were coming in May they would not want to miss the Jubilee Jam festival. In September they can catch CelticFest which is quite good but not terribly 'indigenous', and the Farish Street Festival which I have not attended, have no idea how much music is presented.

And a final note, I've been bugged about the above dire warnings about hurricane season and imaginary monsoon seasons. You can't skip coming somewhere for 6 months of the year because there are hurricanes some years in some spots.   If one should happen to approach one part of the Texas Coast which will affect this trip (doubtful from their itinerary), they will have plenty of warning and they simply reroute to avoid the storm, it's no big deal.