Outlook 2010: Reminders in a calendar of a public folder

We use Outlook 2010 with Exchange 2010.
There is a calendar in the public folders. Several People have the permission as "author" for this public Folder calendar.

One of the "authors" creates an appointment with a reminder in his own calendar.
Then he copies this appointment with the reminder to the calendar of the public folder.

A public Folder itself does not Support a reminder in the calendar. But if you copy an appointment with a reminder from your own Outlook calendar to the calendar in the public Folder, then a reminder in a calendar of a public Folder is supported.

The result is: Every other "author" gets this reminder popping up in his own Outlook calendar.

The question is: How to prevent the reminders popping up in the outlook of the other "authors"?