External presenter can't join live-event after it started?

Paul McDevitt 

External Presenters are now much easier to handle, I made a video demo of it today

What Microsoft call Webinars is also coming soon, and isn't related to Live Events but regular meetings. As meetings will soon allow 1000 attendees with an overflow to 10,000 viewers we don't need to use a Live Event in order to achieve scale, it's more of an choice whether you need the production experience. Maybe required for an all company broadcast, but not for what most of us would call a webinar. Meetings already have plenty of capabilities for attendee and presenter roles (including promotion), audio mute, video mute, reactions, raise hands etc. etc.

The feature being called Webinars is really meeting registration, you can create a sign-up page where people can register for your meeting and then they receive an actual invite. There's then some kind a connection between the registered people and who attended. It's due by End May.