I don't believe that's possible. It sounds like what you really want/need is a Task Reminder app, and not a calendar event, and I would imagine that there are likely a number of Task Reminder apps that could do this for you. Further, just some food for thought, is there a real reason you'd need to auto-delete the reminders/tasks after you've completed them? If you enter them in your Google Calendar, it's not as if they'd be taking up any significant amount of memory (if any?) on your device. Just something to consider in case you really don't need the specific functionality that you're asking about. Anyway, hope this reply was of some help. If not, I tried my best ;-)