Thank you to everyone for your helpful responses!!
Ty – I am grateful for your response. It seems like a good idea to get audio from both a mic on the podium and from the mixer. Given that I have two cameras I can manage this set up. I would like to have a good recording of the questions and the askers will be on camera. There will be a runner to give a mic to the speakers. Unfortunately having the speakers go to one set mic will not be an option. In this case, I assume the audio I get from the mixer will be useful if the buzz is not too great. I can also have the boom operator try and get the boom mic close enough to the askers that this may be useful as well. Does that sound like a good approach?
Is there anything that can be done to reduce the buzz of the sound coming from the mixer?
Thank you very much!
Rebecca