If you have display events from the past off, then (as you would image) you can't see any events from the past.
However, what if you want to see events from the past to get information from them, or to duplicate them?
What I usually do is simply turn past events on temporarily, clone the event I want and then change it to a future event. And then turn past events back off.
The other thing you could do to see past events is:
Create a new widget.
Use the sources tab to tell the widget to pull in events from the widget you want to see events from the past. To do this, click event sources, and then click on the name of the other widget.
This new widget can then be used to see past events, modify and duplicate them without affecting your other widget that is live on your website.