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As you said above, Microsoft Teams live event has 15 to 60 second delay from the time a media stream is broadcast to when attendees see it. Unfortunately it did not provide such options for users to adjust the delay of Live Event now. As a workaround, you could make someone who don't want to have delay to become a presenter.
In this way, we recommend you that please give a feedback to Teams UserVoice. 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.
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