Currently Being ModeratedFeb 4, 2012 4:52 PM (in response to SAHerman85)
If you are using a calendar app on your computer that is supported for syncing calendars/calendar events with an iOS device, this is selected under the Info tab for the iTunes sync preferences with each device.
If you have a Gmail account and use Gmail's online calendar, you can access your Gmail account on each device which includes push access for received messages, and over the air syncing for your Google online calendar and contacts with each device. The same applies with a Hotmail or Windows Live account accessed as an Exchange account with each device, and the same with a free Apple iCloud account which also includes a find my device feature if the device is lost or stolen. iCloud also includes an online backup for each device along with several other features.