Webinar / Live event function on Teams not showing

Hi, it's rolling out right now so just sit tight and wait for it. You could reach out to your admin and ask if they are allowing webinars (default is available). You can also sign out and back in to refresh things, sometimes that quickens the appearance.

https://www.microsoft.com/en-ww/microsoft-365/roadmap?filters=&searchterms=80099