The 2021 Katy Regional is the only Regional in history after the new class were introduced where every finalist was in Class 4A, and all other three classes were represented in exhibition so here's the schedule for example:
2:24 p.m. – Friendswood H.S., TX..........
5:00 p.m. – EXHIBITION: University of Houston
Ok I made a mistake. I forgot 2021 was the start of 12 finalist spot and not 10 plus, I confused their Prelims schedule and not finals by accident. So, Friendswood in 11th and SFA in 12th breaks it since they're in 3A. In fact, there has never been a regional where one class were represented in finals and all other three classes were represented in exhibition.
7:45 p.m. – Class A Exhibition: Odem H.S., TX8:00 p.m. – Cy-Fair H.S., TX
8:15 p.m. – Stephen F. Austin H.S., TX (AAA)
8:30 p.m. – Oak Ridge H.S., TX
8:45 p.m. – Dawson H.S., TX
9:00 p.m. – Friendswood H.S., TX (Class AAA)
9:15 p.m. – James E. Taylor H.S., TX
9:30 p.m. – Ronald Reagan H.S., TX
9:45 p.m. – Pearland H.S., TX
10:00 p.m. – Seven Lakes H.S., TX
10:15 p.m. – Westlake H.S., TX
10:30 p.m. – Lake Travis H.S., TX
10:45 p.m. – Cedar Ridge H.S., TX
11:00 p.m. – Class AA Exhibition: Little Cypress-Mauriceville H.S., TX