Q. Can participants in a meeting be named as long as what is said is not attributed? A. It is important to think about the spirit of the Rule. For example, sometimes speakers need to be named when publicizing the meeting. The Rule is more about the dissemination of the information after the event—nothing should be done to identify, either explicitly or implicitly, who said what.
which seems reasonable. The comment about not circulating the attendee list beyond the participants is a response to the question “Can a list of attendees at the meeting be published?”, and my impression is that it is only meant as an answer to this question: i.e. such a list should not be published outside of the meeting, but it is OK if some people happen to come across it randomly. So I think you are just taking the Chatham Rule much more literally than it is intended.
On the Chatham House website I see
which seems reasonable. The comment about not circulating the attendee list beyond the participants is a response to the question “Can a list of attendees at the meeting be published?”, and my impression is that it is only meant as an answer to this question: i.e. such a list should not be published outside of the meeting, but it is OK if some people happen to come across it randomly. So I think you are just taking the Chatham Rule much more literally than it is intended.