Currently there is no way to findout who organized an event. By MS Graph, you can see the " organizer "-Field, which should be included.   There are more information within the attendees, like type and status, which also may be interesting. Sending a mail to all required attendees will also inform people which did not accept an event.     Background: I´d like to change the event location to inform all accepted attendees. The attendees won´t receive an update, if I´m not the organizer. The even would only be updated locally in my calendar. In that case, I´d like to send a seperate email, to all attendees, with the new location information.   This Idea comes from a Question in the general topic. ... View more