The best option is to create a NOTICE that is called Calendar and maybe SET AS FEATURE, so that it is pinned to the top of the Notice list.
Have your calendar URL inserted as a link, so that APP users can also access it.

The link can be obtained by clicking on the calendar icon on your PORTAL
Copy the physical link of the address bar and paste into your notice.
We are working on the ability to have an icon on the APP to show the calendar.
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