1. They had many teams who had to put their things on a shared Google Sheets or similar

2. They used placeholders to prevent leaks

2.a. Some teams put their content just-in-time

3. The person running the presentation started the presentation view once they had set up video etc. just before launching stream

4. Other teams corrected their content

5. The presentation view being started means that only the ones in 2.a were correct.

Now we wait to see.