From the merch store on the website, it looks like these groups will be present:
Aberdeen Central "Eagle Express"
Aberdeen Central "Special Request"
Beadle Middle "Show Dogs"
Beadle Middle "Encore"
Benson "Resilience"
Brandon "Blitz"
Brandon "Boom"
Brandon "Bellas"
Brandon "Brio"
Bryan "Surround Sound"
Lewis Central "Corporation"
Lewis Central "Company"
Lewis and Clark Middle "Discovery"
Mercy "Treblemakers"
Millard North "Stampede"
Millard North "Cavallo"
Millard North "Intensity"
Millard North "Illumination"
Millard North "Infinity"
North Ridge Middle "The Aviators"
Omaha South "The Ambassadors"
Omaha South "Amplify"
Russell "Leaders of the Pack"
Russell "Subwoofers"
Smith-Cotton "New Score Singers"
Smith-Cotton "Boradway Velocity"
Westside "Warrior Express"
Westside "Amazing Technicolor Show Choir"
Westside "Simply Irresistible"
