In the installation of our customer it is possible to share your calendar with others. A shared calendar can be opened by "person 2" to whom "person 1" has granted (management) share privileges to. "Person 2" can create an appointment for "person 1" in the shared calendar. But the created appointment will be for "person 2", not "person 1".
See attached images. Joanna Doe has granted management privileges to John Doe. John Doe tried to create an appointment for Joanna in the calendar of Joanna, which he has opened (the blue calendar is of Joanna). When you double click the "New appointment by John for Joanna" you get the second image. And the owner of this appointment is John, and not Joanna.