The Sioux City Journal makes it sound like Rock Valley has split from one mixed group in to two groups (an all-male and an all-female). It also said that Harrisburg High and Sioux Center Middle School performed as well.
Idk if this matters in the grand scheme of things, but the Heelan folks made it a point to let people know that the festival was happening in the "O'Gorman Fieldhouse".
This one is only Saturday and will be held in a noncompetitive clinic format where groups have 1 hour apiece to perform and be critiqued. I don't have a schedule or full list but Hinton, Sergeant Bluff-Luton, Rock Valley, Sioux Center and Spirit Lake will be there to name a few.