You can sync Calendar in these ways:
In iTunes: Use the device settings panes to sync with iCal or Microsoft Entourage on a Mac, or
with Microsoft Outlook 2003, 2007, or 2010 on a PC, when you connect iPad to your computer.
In Settings: Turn on Calendars in your iCloud, Microsoft Exchange, Google, or Yahoo! accounts
to sync your calendar information over the Internet, or to set up a CalDAV account if your
company or organization supports it. See “Setting up mail and other accounts” on page 18.