Oh wow, what an absolutely wonderful honor this is to be invited to watch...sports ball! Sincerely, he wouldn't panic at all. Cadmael is one of those dudes who can't stop smiling even when everything is going to absolute hell all around him. So basically he would just wing it completely on the day of. He would do his best to certainly not try to disrespect the sport, whatever it was, by making a joke that would come off in bad taste, so he'll certainly do maybe a little research beforehand to make sure he misses accidentally referencing any scandals that might kill the vibe. After that though, he's just gonna be the gooft color commentator that just completely overexplains everything that's going on in the game. Stuff like: "Oh wow! The man takes the long stick and hits the rubber black disc into the basket!" Using hockey as an example.