Apple’s iCloud service is your answer when you’d like to synchronize calendars on two devices.
First, sign into the same iCloud account on both iPads. (A reader recently asked how to sync an iPad and iPad mini.)
On each iPad, open the Settings app, scroll to iCloud and sign in with your Apple ID.
Once you’re logged in on each iPad, look at the list of iCloud options you can enable.
Make sure you enable Calendars in that preference pane before you close it.
Now you need to make sure each iPad is showing the same iCloud calendar.
Open iCal on each iPad and touch the word Calendars on the bottom row in the middle. This will bring up a list of calendars. Look for the iCloud calendars. They may or may not be listed.
If none are listed, touch the Edit button and add one. Give it whatever name you like.
Any iCloud calendars should show up in the Calendars list on both iPads.
There is a check mark that appears to the left of the name of each calendar that is visible on your iPad.
Make sure the calendar you use has a check mark on both iPads.
Touching your finger on the calendar’s name will turn the visibility (check mark) on or off for each iPad.
I did a test.
I’m signed into the same iCloud account on my iPhone and iPad. I created a new iCloud calendar named Home and made sure it was visible on both devices.
I then created a calendar entry on the iPad, and it showed up on the iPhone within 10 seconds. I created an entry from the iPhone and it showed up on the iPad equally fast.