At your next event, consider using tablets to get people to submit questions for a Q&A.
It’s quick and offers anonymity. The trick is to keep it focused e.g. “What questions do you have on how we will deliver project X?” Use a comfort break to theme the input and decide who will respond.
Back in plenary, flag the key themes and use exemplar questions: “We had 168 questions, and they broke down into these five main themes… The big-hitter was resources. Here’s a typical question… Jo, can you pick this one up?”