Cant you find some important events in your default calendar which has happened more than one year ago?
Find Events Free will help you!
You can search your entire Calendar database without time limits, just set the Start date in Search Options.
During search the application will examine all your events within your Calendar database, and makes a list if the found event title or notes contain the searched text.
You can open your found event with the built-in calendar by tapping the event in the list.
If you have too many results, you can easily scroll down the list by tapping the Scroll icon on the left corner.