How to add the +New button to a calendar

The +new button is missing from a calendar, how do I reinstate it?

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  • Just to verify: 

    1. Does the Group Banner widget exist on the calendar page you're testing?

    2. Does the ability to create an event show in other areas of the same group via the + New button (for example, on the group homepage)?

    3. Does the calendar exist in the site root group or a somewhere else?