Hi @Joy Gross are you creating these events as courses? Only scheduled sessions appear in the calendar...you cannot add external events that are not part of courses. You can create a session with custom link to your events if they occur outside the your normal scheduling process in the LMS. Use the “Custom Tool” option when you create the sessions. 

@Irnlab Thank you very much for the info!

When you say use the “Custom tool” option, where is that located? I just created a course with the title of an event to add to the calendar, but I don’t see Custom tool?

you need to create an ILT course and the create a session...when you add the event to the session, choose the Video Conferencing option and you will be able to add your custom link there.