Convert meeting to webinar in OnZOOM event

You should be able to find the meeting listed when logged into the Events license holder's account via zoom.us/meeting#/upcoming and then click on the meeting title.

You should see the following option near the bottom of the page:

Welcome to the Zoom Community, @K10.

Clarification, please: There are two separate Zoom products: OnZoom, and Zoom Events.

I’m not aware of any way to convert OnZoom events – period. 

It’s possible to convert a Zoom Meeting or Webinar to a Zoom Event from within the Hub view:

As @bstrelko has pointed out, it’s also possible to convert a Zoom Meeting to a Zoom Webinar as well, without involving Zoom Events or OnZoom