If you have added the calendar from above and it isn't showing on your iphone, launch your web browser (Safari, Chrome, etc) on your iPhone.
Sign in if you aren't already.
Under Shared Calendars, tick the boxes for the calendars you want to see on iPhone.
Add a photo above and a description for your event
Add a photo above and a description for your event
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Add a photo above and a description for your event
Add a photo above and a description for your event