title: Can't load calendar event with getEventByID for events created on iOS due to different eventId format
body: <p>I have a Google Sheet with a list of events and each line contains the CalendarId and EventId.</p>
  
  <p>Some EventId's are in a different format. For example: </p>
  
  <pre><code>- usual format: 2nn755esk1ddgg8bf4efabq5i0@google.com
  - different format: 4F29BF66-4264-44E9-9162-9E6B9B97AF53
  </code></pre>
  
  <p>When I try to load an event with the different format I get "null" instead of the event object.</p>
  
  <p>sample code:</p>
  
  <pre><code>// event load returns null
  var calendar1 = CalendarApp.getCalendarById('stepvda.net_qfrvg5ejjrv97ps04o16fjiokk@group.calendar.google.com');
  var event1 = calendar1.getEventById('4F29BF66-4264-44E9-9162-9E6B9B97AF53'); 
  
  // event code returns event object correctly
  var calendar2 = CalendarApp.getCalendarById('stepvda.net_dunvv2cuqlirkucfamgj0vec18@group.calendar.google.com');
  var event2 = calendar2.getEventById('2nn755esk1ddgg8bf4efabq5i0@google.com'); 
  </code></pre>
  
  <p>I noticed that the different eventId format seems to come from events I created in iOS on my iPhone where the normal format are events I created in the Google Calendar web app.</p>
  
  <p>Any idea how I can load events with the different format for the eventId?</p>