This feature is not supported in Microsoft Teams live event, but it would be a good feature to have.
I have created a feedback in Teams UserVoice. We recommend you vote for it here in the following link(https://microsoftteams.uservoice.com/forums/555103-public/suggestions/42033403-make-several-consequent-not-parallel-panels-in-a). Microsoft will always focus on customer’s feedback and experience, some new features would be added to the services based on customers' feedback in the future, and your good ideas will be very helpful for them to improve the service.
Your time, understanding and cooperation will be highly appreciated.
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.