Sender information in CalendarApp.CalendarEvent - google-apps-script

Question

I'm a bit baffled! Many of my customers send me GCal invites but the creator shows up as me. I want to extract the actual sender address from the CalendarEvent. See screen shot as an example. Kathryn is the sender but I am listed as the sender.
Sample screen shot showing different sender vs. creator

Answer 1

Issue:
The main name that is displayed in the UI refers to the organizer of the event, which isn't necessarily the same as the event creator (for example, the event creator might call Events: move to move the event to another calendar, changing the event's organizer - see Organizers).
Solution:
You can retrieve the event organizer if you use Calendar API (I don't think that's possible with Apps Script Calendar service, since GuestStatus doesn't seem to return OWNER in all appropriate cases, at least from my experience).
An easy way to use the API in Apps Script is to use the Advanced Calendar Service (in order to use that, you'll have to enable the advance service first).
Then, using the API you could:
Use Events.list to list the events in your desired calendar according to a time range, as you are already doing with CalendarApp.
Retrieve your desired event.
Access the field organizer of your event, which contains the organizer's email address as well as other information about this user.
Code sample:
function getOrganizer() {
const calendarId = "YOUR_CALENDAR_ID";
const optionalArgs = {
"timeMin": "2021-05-17T00:00:00-02:00", // Change accordingly, min end time to filter
"timeMax": "2021-05-19T00:00:00-02:00" // Change accordingly, max start time to filter
};
const events = Calendar.Events.list(calendarId, optionalArgs)["items"];
const event = events[0];
const organizer = event["organizer"];
console.log(organizer);
const organizerEmailAddress = organizer["email"];
console.log(organizerEmailAddress);
}