Restore Deleted Events in Google Calendar

Ever deleted a calendar event by mistake and wanted to get it back? Now you can. Google has added Trash functionality to Google Calendar, providing an easy way for you to view, permanently delete, or restore individual and recurring deleted calendar events. 

Trash is accessible from the Calendar's dropdown menu in the "My calendars" section as well as from Calendar Settings. This functionality is available for both primary calendars and secondary calendars for which people have edit rights.

More information is available at: https://support.google.com/calendar/answer/37113?p=trash_learnmore&rd=1#trash