On the Create new event page you see:
- Admin Only (default)

If you want to change from the default you click Admin Only and...

You are presented with a dialog box with these options
- Public
- Admin only (selected)
- Restricted

Then you make your selection
Then you click Save

===

Why not move the contents of the dialog box to the Create New Event page where the initial selection Admin only is shown?
You can set the default Admin only by a 3 option radio button
The other options:
- Public
- Restricted

When an event is shown whichever option was selected is shown as the selected radio button

It reduces steps for the creater of the Calendar events.