I accidentally erased my calendars entries. How do I restore or get back

If you have a backup.

hope you had your email and Icloud on, in setting go to mail and and switch off and then again turn on the calander , do the same in icloud setting ... And try to restart phone to get it calamder back even faster ...

banzai ..! It's done it will look like this

If you Calendar entry was originally stored in iCloud, you can now restore those using iCloud.com:

1. Open www.cloud.com/#settings

2. Scroll to the bottom

3. Click on "Restore Calendars and Reminders"

4. Select an archive of Calendars from before you deleted the event(s)

Hope you have a backup for your iPhone 6. The easy iPhone 6 calendar entries recovery is restoring them from a backup.