opening documents (calendar) in iCloud Drive on mini iPad
How do I open documents on my mini iPad (iOS 9) which have been stored in iCloud Drive on my mac mini (OS X Yosemite
iPad Mini, iOS 9
Set up iCloud Drive on all of your devices
The Calendar is an app on your iPad. If you are using iCloud then it should sync automatically with the one on your computer and any other devices you use. There is no need to use iCloud Drive with it.
Please get iPad User Guide For iOS 9 by Apple Inc. on iBooks