The schedule for this one is posted. It's a middle school only non-competitive festival. There are 24 total choirs split into 3 equal groups of 8 as morning, afternoon, and evening performance sessions. There is no real tier or difference between the sessions, to my knowledge, it's just the way that the folks at Millard South split it up. It's posted above in chronological order as a result. They do have an awards ceremony after each session and award captions, but not placements.
South on Stage has exhibition performances at 11:00 am and 7:40 pm, and Stage One will be on at 3:20 pm.