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My wife and I both have iPads. We share a calendar (iCal), to post appointments, trips and so forth. The issue is that since I’m the organizer, she can’t modify or delete anything I posted. I on the other hand, I can delete/change anything she posts. How can it be set so both people can make changes and modifications to any appointment?
Thank you in advance.
PC
iPad, iOS 10
The setting of view/edit for her did not allow her to edit an existing appointment of mine. It seems not to work. The only option she has is to unsubscribe from the calendar and no other options.
Change a person’s access to a shared calendar
After you invite a person to share your calendar, you can turn on or off their ability to edit the calendar, or stop sharing the calendar with that person.
, tap 
next to the shared calendar, then tap the person.Hi pcman3550, thank you for posting in Apple Support Communities.
The following link explains how to share iCloud calendars and the ability to Allow Editing for the shared Calendar which I hope helps with your issue:
https://support.apple.com/en-au/guide/ipad/ipadc2a14a22/ipados
Thank you.
I can offer one more suggestion, which is an option I use, but that is to add the email account to the iPad as opposed to sharing:
Settings > Mail > Accounts > Add Account
You can then deselect the options: Mail, Contacts etc and only ensure Calendar remains selected.
This may need the other persons approval (may send a code to the device e.g. two factor authentication) but it allows full editing of the account in Calendar and be able to see each others Calendar and can also identify each others Calendar by choosing different colours.
Sharing iCalendar so two people add/delete modify
