title: Synching GSheet with GCalendar
body: <p>I successfully linked my GSheet to GCalendar but now I have some open questions:</p>
  <ol>
  <li><p>How can I avoid that multiple Calendar events are created when running the AppsScript Code?<a href="https://i.stack.imgur.com/cO15V.png" rel="nofollow noreferrer">the Calendar Event bla1 should only be once in my calendar. But everytime I run the code in the Apps Script GCalendar keeps adding more bla1 events</a></p>
  </li>
  <li><p>If I would update an event (e.g. the start time changed), How can it be changed in my Calendar automatically?</p>
  </li>
  <li><p>How could I automatically add attendees to the events and have the event send out invites?</p>
  </li>
  </ol>
  <p>Here is the Apps Script code so far:
  <a href="https://i.stack.imgur.com/1TtjU.png" rel="nofollow noreferrer">code</a></p>
  <p>And here is the Spreadsheet:
  <a href="https://i.stack.imgur.com/Zfu99.png" rel="nofollow noreferrer">Spreadsheet</a></p>