You can enter a Clubs note for a future date by going to the Clubs register for the date in question (via Workspace > Clubs or Admin > Config > Clubs).
You will then see a list with the students who are scheduled to attend the club listed. There is a Notes column where you can add any further information, for example, if the child had a meal during the session. Click on Add Note in the Notes column, then select the tick to save this note.
A register cannot be submitted for future club sessions, so students cannot be marked present, but the note will be available to view on the selected day of the club session.