I only want to create the meeting and reserve it in the calendars, without making the meeting transparent to the meeting participants. How do I do that?

The agenda items and meeting documents only become visible when you 'publish' the meeting.

The agenda items and meeting documents only become visible when you 'publish' the meeting. During the creation of a meeting you can choose to send the meeting request immediately, or you can do this at a later time. This is desirable if you may have doubts about the date on which the meeting will actually take place. In other words: creating a meeting is done in three steps:
- creating the meeting.
- planning of the meeting.
- publishing the meeting.

Send the meeting request while creating the meeting:

Send meeting request

Or when you want to send the request later:

Send meeting request after creation