How can "proposed new times" be retrieved for an event?

Question

TL;DR: When an attendee has proposed a new time for an event, is it possible for the organizer to retrieve the proposed new time via the Google Calendar API, e.g. from Events: get or Events: list?

Example flow

1. Organizer invites Attendee to an event at 1700 EDT

   

2. Attendee receives the event invitation for 1500 MDT

   

3. Attendee proposes a new time of 1530 MDT

   

   

   

4. Organizer sees that there is a proposed new time

   

Resulting event data from the Google Calendar API

When the organizer retrieves the above event via the Events: get and Events: list APIs, all they see is that the attendee has a tentative response status. There is nothing to indicate that a new time has been proposed, nor what that time is:

{
  ...,
  "kind": "calendar#event",
  "organizer": {
    "email": "[email protected]",
    "self": true
  },
  "start": {
    "dateTime": "2019-09-17T17:00:00-04:00"
  },
  "end": {
    "dateTime": "2019-09-17T17:30:00-04:00"
  },
  "attendees": [
    {
      "email": "[email protected]",
      "responseStatus": "tentative"
    },
    {
      "email": "[email protected]",
      "organizer": true,
      "self": true,
      "responseStatus": "accepted"
    }
  ],
  ...
}

Answer 1

The Google Calendar team has confirmed that, as of September 2019, this is not available via the API and there is no ongoing work to add it to the API.