Thanks for the request. Currently there is a way to set this property through powershell for groups, but it only works for users in OWA. We have this in our plans for Outlook desktop as well and will be working on it.
Not placing Group Calendar permissions into the hands of the end-user will defeat the purpose of having the function in the first place. If custom powershell scripts are required then the user is relying on someone else to manage the access. Simply create a setting where only Group Owners can choose to "Allow members to add events (yes or no)" on the Group Calendar, and you will make a lot of users very happy.
Can you provide an update on this function. Last comment 09/19/17 was "We have this in our plans for Outlook desktop as well and will be working on it." Is it now available? If not, when?
If I could get everyone in our organization to actually come to this page and vote, you would see that our userbase (65K+) would overwhelmingly agree to the importance of this functionality. Facility Communication Managers need a method for posting event calendars easily without worry that viewers will be able to make changes. It is very difficult to understand why this is not an obvious function. Hopefully I can get our users to come vote.Tim Farmer supported this idea ·