If this is an event session, you do not need to list all the guests. Just anyone I should know about or focus on.
Do any of the participants have special needs, limited mobilities, etc? Anything specific I can do to get some smiles out of the littles? Is your group more of a laid back, silly group or do they want to get down to business and keep it serious? Are there some specific shots you want to make sure I don't miss? This is a great place to note anything like that!