Thanks...but I am still not clear, if the officer's can stifle any controversial issue someone in the audience may attempt to bring up at the meeting?
The Chair is in full control once the Agenda is adopted. The Board owns the Agenda, so they can modify it. All actions that take place has to be first recognized by the Chair. The Chair may choose to not recognize someone from the floor if the act is not in accordance with the agenda. For example in an Q&A session, if it is required to register to be recognized for making a statement then the chair is likely to not recognize someone who did not register. etc. OTOH the Board can overturn a Chair's ruling since it is the Board that own the Agenda, not the Chair.
In summary, you cannot just stand up randomly in a meeting and start making a statement. if you try, you will be hauled out and ejected by security.
Controversial matters can be placed on the agenda following procedures that are required by the SEC to be part of practices for conducting a Board meeting of a publicly traded corporation. As I understand it privately held corporations apparently are a different matter. Witness the circus that is Twitter which at present apparently does not even have a Board in a normal sense of usage of the term.
Similarly, organizations that claim tax exemption under 501 (RPA is one such) have to follow certain procedures in their Board Meetings. I have actually been a member of the Board of several 501(c)3 tax exempt organization and have even chaired a meeting or two as Chair pro-tem.
The Amtrak Board Session that we attended was a sort of a special session for sharing information and Q&A in which no other business was conducted.