You have to wait till the presentation is over, but you can basically ask any questions you want. Also they do try to answer all the questions, but it might depend on how many people show up, but for the most part all questions are answered.
I could submit the questions, but they don't keep a transcript of them so I would have to copy the answers. Let me think about this, I am in pretty close contact with the center on a pretty regular basis and might be able to send them and get a reply.