I currently have a Task VR going that simply prevents a Task from being edited once the Status is marked Completed.

Unforunately, Events do not have a Status field. Because of the quirky way Events act in Salesforce like Outllook events, is anyone familiar with an effective way to allow users to update and edit events up until they are completed and then essentially lock them? Is there a way to say "if now is greater than end time, then no can do" or something even easier than that, that I am missing?

Thanks in advance!