As the person creating an event, simply create an Appointment (in Outlook 2016) or an event with no attendees in Outlook on the web with the “Send a meeting invitation to group members” unchecked.
Doing so will make sure the events stay only in the Group calendar, and is perfect for FYI items like out-of-office.
Please note that Planner has its own UserVoice site that its team monitors for feature requests. You can find it here: http://planner.uservoice.com/
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