When a live event is created with a Q&A option, attendees can start asking questions even if the event hasn't started. These questions are only visible to moderators until they publish them to the event.
Select Q&A on the right side of the screen, then select Open.
Select Publish to make the question and answer visible to everyone. Select a question and choose Private reply to respond to it. The answer is instantly available to the person who asked the question.
Producers and attendees can like questions by selecting the thumb icon.
If you want to say something to all in chat, type an announcement at the bottom of the panel and select Send.
When you're event is over, you can download reports including a Q&A report by selecting the menu button on the live event invite.
Participate in a Q&A in a live event in Teams