These are basically lectures about different aspects of the ship. The one I went to lasted about 90 minutes and was about the construction and operation of the ship. Capt. Henry introduced the session and talked about his involvement with the early construction. We saw a video about the building of the Magic. Two other officers were present after the video to discuss their roles, training and duties. Q&A were definitely encouraged.
Later, at a session I did not attend, the entire complement of senior officers ( department heads and captains) were there for a Q&A.
It was a great way to learn more about the ship. Unfortunately, bridge tours are no longer available due to higher security levels.