A Teams live event is different than a typical Teams meeting. Taken from Microsoft's documentation:
Teams live events is an extension of Teams meetings, enabling users to broadcast video and meeting content to a large online audience. These are meant for one-to-many communications where the host of the event is leading the interactions and audience participation is primarily to view the content shared by host.
i.e. - If you want to chat with and collaborate with others, create a Teams meeting. If you want to broadcast a message to others without the live video chat component, create a live event.
Note: if you or someone you know would like more information on how to join a Teams live event, please see this article: https://help.mysouthland.com/joining_a_teams_meeting_or_live_event_as_a_guest
If you have any further questions, or if you are ever unsure about what to do, please contact TSD at help@mysouthland.com.