They intend to bust some webmastering myths with some presentations and then there will be a long Q&A session via Live chat.
From their post:
"Here's what you'll need
- About an hour of free time
- A computer with audio capabilities that is connected to the Internet and has these additional specifications (We'll be broadcasting via the Internet tubes this time rather than over the phone lines)
- A URL for the chat, which you can only get when you register for the event (don't worry -- it's fast and painless!)
- Costumes: optional
You need to register for the event and post questions via Google moderator.