ANNOUNCED 5 January 2018
FYI: we've tweaked the "Do not display Who's Attending list to Members" feature to respond the same for both members AND administrators.
When this box is checked in the event editor (DETAILS > ATTENDANCE > Do not display Who's Attending list to Members) now both members and administrators have the list suppressed on the event page.
This does not affect the event report for administrators, where you will still have access to seeing the attending event list.