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.
Cmdlets are available today to configure auto-reply, we’ll document it shortly.Cindy commented
Working on it was the answer in 2017. It is now 2019, when will this document be ready and where is it located?