Yes, you are right. There is no clear line between those two types of questions. And perhaps the distinction is not a good way of expressing what I mean.
Maybe like this: take for instance my interest in how consensus is established in meetings. I would not put that as a question of interest for everyone to discuss at the symposium. Instead, I might suggest something like “How has decision-making in meetings been studied across disciplines?” (Though I personally still wouldn’t put that as a priority question, I’m just using this as an example.)
Do you see what I mean?