When you get to your calendars, drag down on the list and release. Open the Calendar app on your iOS device, and then touch the “Calendars” button at the bottom. So to refresh your iCloud calendars, here’s what you’ll do. It’s a way to force your calendars or contacts to refresh themselves, and it’s so quick! You don’t even have to restart any devices, and whoo-hoo to that! In my experience, though, the problem is almost always with iOS, and if that seems to be the case for you, there’s a quick trick you can try to get things running smoothly again. Whichever one doesn’t appear identifies the device that’s the culprit!
What I usually do is add a test contact (for example) to my Mac and one to my iPhone, and then I log on to with my Apple ID to see which contact arrives. If your iCloud calendar or contact data isn’t syncing between your devices, an important troubleshooting step is to figure out where the bottleneck is.