HT1338 Calendar is missing on my macbook pro. how do I get it back please?

I am on OS X 10.8.3
MacBook Pro
Calendar was fine and in use until I suspect I had visitors and theirchild was on my mac.
On the Dock is  a question mark with the number 28 (today being 28th April) where the Calendar used to be.
No sign of it in Applications or on my mac.
How do I go about re-installing Calendar?
I can't locate any OS disk.

Welcome to the Apple Support Communities
As it's a OS X app, you have to reinstall OS X. Lion and Mountain Lion come with OS X Recovery, so hold Command and R keys while your Mac is starting and reinstall OS X.
Have you checked if Calendar is in the Trash?

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