Can not add invitees to a calendar event after the event has been created

calendarical

I can not find a way to add an invitee after the event has been created and the invite emails sent. Is it possible?

Below is the already created event, where I do not see the field to "add invitees" any more:

This is the already created event, and I do not see anymore 'add invitees'

Here is an event that has not yet been created, thus possible to add invitees:

This is the event that has not yet been created, thus possible to add invitees

EDIT: I use Exchange as the backend for the calendar… though had same issues with Google Calendar as backend as well.

Using Calendar Version 9.0 (2155.15)

I solved the issue of not being able to add an invitee by exporting all my appointments and creating a new iCloud Calendar.