Thanks for the tip. Actually the current behavior is intentional—we’re differentiating events that should not “slip by” without being completed.

I thought that might be the case - unfortunately, my eye is drawn to every single past event for that very reason.

A better solution then my initial suggestions might be adding the ability to manually mark all events as “complete” regardless of the type - this would be handy for cancelled appointments, as well as events which have passed.  Once they are processed there is then a visual cue to ignore them, but nothing happens until they are manually flagged “complete.“

If you mark “Keep the event as a next action until someone completes it” for all your events then you can get the cross out when you mark them complete. Of course it means you have to mark ALL your appointments complete rather than just letting them expire.