I have a black screen on my live event
The first thing you need to check here is that you are starting the event using the 'Start' button.
The webinar or meeting will not start if you just select a video or screen share option, you need to click the 'start' button.
Another issue could be the camera. You need to choose the correct camera (if you have an external and built in camera).
You can choose the correct camera in the browser bar on the camera icon.
Please check the image below:
When you select the correct camera, save the changes and refresh the page.
Hope this helps.