The questions asked were about whether or not other councillors, who are not on the committee, should be informed of a committee meeting before it takes place (not after it has happened), and whether appointments to a committee should be approved by council.
Mentorman has answered these questions and has confirmed that all committee meetings must be notified as per standing orders as they are open to the public. My understanding is, that the requirement for notification of the meeting doesn't change, even if the public are excluded from the meeting itself.
Thank you for your response, CG, but it seems to focus more on possible reasons for calling a committee meeting, rather than about notification and minuting of the meeting, and approval of committee members.