I'll be attending the festival on the Fourth of July as long as it doesn't rain. And don't foreget that other festival, La Fete de Marquette in Madison, WI on July 12 - 15, with Francophone music and Sunday dedicated to Louisiana music, featuring FeuFollet and CJ Chenire and our local band the Cajun Strangers.
You are thinking of the right place. Scorching hot and no shade. They have planted some trees, but they don't cast must shade at this point. There will be a bigger dance floor and another tent for shade and hopefully the weather will be better.