They didn't compete in Tier II Mixed - they were in the Tier II Finals. Those aren't the same thing, just to be clear. Tier II Finals just indicates it's the second, lower, set of finals at a competition. Carmel MS competed in the middle school division in prelims and the middle school division was eligible, alongside Mixed Tier II, for Tier II Finals. Both the middle school and mixed tier II prelims divisions were in the auditorium and judged by the same panel. Hope that helps!
No problem at all. I can understand the confusion.
But yeah, you're definitely right. It's unusual. Carmel MS is likely up there among the best when it comes to middle school groups. Fairfield MS and Martinsburg South MS also come to mind as middle school choirs that have placed, taken captions from, and beat high school level choirs.
Schedule is posted. Tier I is in the Gym and Tier II is in the Auditorium. There will be 4 total sets of finals - Mixed Tier I (5 finalists) and Women's Tier I (3 finalists) both in the Gym and then Mixed Tier II/Middle School (5 finalists) and Women's Tier II (3 finalists) in the Auditorium.
10:55 am - Brownsburg "Bella Voce" (Exhibition - Auditorium)
3:10 pm - Women's Tier II Finalists Announced (Auditorium)
3:30 pm - Women's Tier I Finalists Announced (Gym)
5:15 pm - Brownsburg "Starlight Voices" (Exhibition - Gym)
5:45 pm - Preliminary Awards
7:00 pm - Women's Finalists #1
7:25 pm - Women's Finalist #2
7:50 pm - Women's Finalist #3
8:25 pm - Mixed Finalist #1
8:50 pm - Mixed Finalist #2
9:15 pm - Mixed Finalist #3
9:40 pm - Mixed Finalist #4
10:05 pm - Mixed Finalist #5
10:30 pm - Brownsburg "Spotlight Singers & Company" (Exhibition - Gym)
11:00 pm - Final Awards
*Note: Finals times are the exact same for Tier I and Tier II just in separate venues (Tier I in Gym, Tier II in Auditorium).