Without iPad plugging into your Mac or PC, now you can sync your Yahoo! Calendar to your iPad easily.
* Going to the iPad settings application
* Tap Mail, Contacts, Calendars > Add Account > Other.
* Then tap Add CalDAV Account.
* Type yahoo for the Server and type into your Yahoo! ID (without @yahoo.com) and password. Click save.
* After iPad verify all informations, you can start syncing your Yahoo! Calendar with your iPad in a few seconds. It's automation.
Now view or edit the Yahoo! Calendar by yourself.