Last year they had 28 bands in Prelims and 14 in Finals so I would think 20 bands this year in Prelims would result in 10 in Finals. Unsure but seems likely.
1) Clear Brook
2) Clements
3) Kempner
Rest, I believe, in no particular order (not sure the order):
Clear Springs
Summer Creek
Clear Falls
Clear Creek
Travis
Tomball
Clear Lake