If you Enable Speaker Pre-Registration in your meeting's registration settings, the registration form will show a checkbox for participants to opt-in to request to speak in the meeting.

On the public registration form, registrants will see an option to be added to the meeting speaker queue:

If a participant requests to speak, this will be designated in the registration table and data export:

You can optionally include a meeting agenda and associate meeting registrants with specific agenda items. Click here to learn more about agenda speaker registration:

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Providing a contactless meeting sign in option to attendees