Exchange Calendar import
If this solution existed I would have been very pleased. Unfortunately I've been searching for this option a lot and the answer is no.

I'm currently using a work-around in which I've logged in with my Exchange account on the iPad at home and only checked the option to display the calendar of that particular Exchange account. (This also works for an iPhone or iPod Touch)

The calendar is now visible to everyone with access to the iDevice, and you can open and combine them in view. So you can see everything together even when it comes from multiple accounts.

I hope this is a possible solution which can work for you, as there is no easy way to copy or sync your calendar (yet).