Just open Teams, select Meetings, then make a new Live Event. We encourage you to review the information here as well.
You do not need to add attendees - anyone invited to the Live Event through Teams automatically becomes a producer. You will receive an Attendee Link that you can share with anyone needing to attend.
For more information on attendee's, click here.
Note: Once made you must manage the meeting through Teams, do not adjust within Outlook.