title: Google Calendar API V3 how do I add an attendee to a list of existing attendees?
body: <p>I already have an $event->attendees with some existing attendees.
  I would like to add new EventAttendee to this event but it looks like my code crushes the old attendees list.</p>
  
  <p>I try </p>
  
  <pre><code>$attendeesx= $event-&gt;getAttendees();
  $attendees = array_push($attendeesx,$newattendee);
  $event-&gt;attendees = $attendees;
  $service-&gt;events-&gt;update(MyCalendar, $event-&gt;getID(), $event);
  </code></pre>
  
  <p>not working. Anyway I would like to add, not replace the old list by a new one.
  Any clue?</p>
  
  <p>What is additionalGuest?  What is it made for?</p>