If you are a session leader, think of this as a short conference that’s all yours. The goals are yours, the topic is yours, the way to organize material and discussion is yours. For more details, see this document:

If you are a session organizer, your job is to facilitate whatever the leader would like to do with the session. You will create the session, distribute any materials the leader wants to make available, and contact the mailing list with logistical information as needed. For more details, see this document:

If you are a member of the mailing list, join the sessions. Here a guide for you, too: