At AKC Nationals each exhibitor submits a few talking points about them and their dog. When they run in Ring 1, the announcers read the speaking points over the loud speaker. At some point over the weekend all teams run in ring one. The last time I went there were 6 different rings but they made it work for each team to get a turn in Ring 1. For challengers and finals there is a separate set of people doing commentary for the live stream, 2 years ago it was Esteban and Sarah from Bad Dog Agility. Not sure who did it this year but it's usually an agility handler with experience. This will be my first year running at NADAC champs and I assume it's done similarly with the handler written speaker notes read over the loudspeaker, correct? I also agree with the other comments that having a sportscaster providing a play by play over the loudspeaker would be an unnecessary distraction but look forward to hearing everyone's speaker points!!
Jen, Sage and Jett