How to add event invite into calendar?

How to add event invite into calendar?

Hello,

I might be missing something but when someone sends me an invite through the CRM I do not see how can I add the that event into my own calendar within the CRM.
Do I have to type in again all the data into my calendar in order to add it? 
I'm sure it's easier than that, but I do not see how to do it... any suggestions?
Thanks in advanced.