In principle, data never just disappears. Below, we explain how you can adjust your settings to display your data again.
There were a few small changes to the calendar and settings in iOS6, and some people may find that their calendar and event information is no longer being displayed.
◉ For those who are using iCloud
-Go to iPad [Settings] → [iCloud] and set [Calendars] to “OFF.”
-When you are setting this to “off,”be sure to select [Keep on my iPad].
(If you select [Delete from my iPad], your data will be deleted.)
-If the message [Turning Off Calendars ] appears, set it to “ON” again.
You’ve finished changing the settings! See if iPlan for iPad is working now.
◉ If for some reason your information is still not being displayed, try the following.
-Go to iPad [Settings] →[Privacy] and select [Calendars].
-Turn [iPlan for iPad] “ON”.
※ If, when you were updating to iOS6, something went wrong during backup or settings (agreeing to delete data, etc.), there is a possibility that data may have been deleted. That said, the system that we use requires the authorization of the user before any data is deleted.