Additional features, settings, or issues not covered by specific Microsoft Teams categories
An Event is designed as a one-to-many broadcast featuring registration pages, dedicated presenter roles, and moderated Q&A. AFAIK, unlike standard meetings, Events do not support native recurrence, so you won't be able to schedule a Webinar or Town Hall to repeat automatically under a single registration link.
As a workaround, you could duplicate each session individually. If you are hosting a Town Hall, you can create the single event in Teams first, open it in your Outlook calendar, and apply a recurrence pattern there to reuse the same join link across sessions.
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hth
Marcin