It happens to me all the time. When attempting to update my Google Calendar (my FAVORITE app), I delete items from the wrong date, and miss the Undo opportunity that immediately pops up. Usually I just recreate the event. For single events, this is no big whoop, but for recurring events, this recreated event is not part of the original, might be named ever so slightly differently, you get my gist. Well today, Google alerted me that I could restore my deleted Calendar item from the Trash. What?!? Google Calendar has Trash? If you know me, you know that I was grinning from ear to ear, because this news is just all kind of awesome. I literally did a happy dance.
To restore deleted calendar items, click the teeny tiny down arrow beside the calendar it was deleted from
Click on View Trash
Check the items you wish to restore
Scroll to the bottom of the screen and click Restore selected items
Deleted calendar items remain in your Trash for 30 days, upon which they are permanently deleted (just like other Google Apps).