The map segment Sprung posted above is pretty much what I expected and it sounds like it covers the areas I associated with the American south. I mentioned Mardi Gras before and think that needs to be included - perhaps it's a plot point towards the end of the run, with people preparing for it through the course of the adventure. A little like the championships of Galar, there may be final battles here, with pokémon battling being heralded as a form of art (perhaps even the secret xth form of art that was foretold in prophecy) so that the plot ends on a nice high, after defeating villains and all the rest along the way.
Perhaps using battling as a form of art (in the sense that it's like a dance) is our trainer's motivation, and other, stuffier, probably older people, don't agree, and the protagonist and their friends want to prove that there is an art and a beauty to it, so that it can be celebrated at the festival, too?