I am not good with a video shooting but, these are may 2 cents
1. Name of the person
You only need to show the name of the person just once unless another person name is shown. Example: Mark then John.
Not very good if it is Mark, then the same Mark again. (Hope you get it
2. Lights Rule
Once the lights are on, you can just speak, it does not matter if the camara has zoom on to you, if the camara does not focus on you, then it is not your fault, cause the cues are either not clear, or everything and everyone is still fresh...
I am not trying to be mean or dumb.. but these are just suggesstion... hey public shows have to be done professionally right?