The most important thing to do for a good session is to communicate with your speakers. The more you and your colleagues communicate about the focus of your session, the more likely the session will be a success. As the organizer, you are the sole recipient of most email communications from SXSW EDU regarding your session. It is incumbent on you to communicate details in those emails with your speakers. You can reference the Speaker and Session Organizer Resources page for a running list of email communications.
Make sure to keep an eye on your inbox and stay up to date with session information in the Session Production Guide (SPG) as you have sole access to this resource.