Avoid those silent moments when nobody has questions or when you have to pass a microphone. Crowdsource the questions from the audience during and after the presentation and start the Q&A with a list of great questions. Let everyone upvote the best ones so you can get the most out of the Q&A time.
Crowdsource the best questions and kickstart discussion amongst the panelists.
Involve your audience in the chat and give them the chance to ask anything.