Calendar Privacy

I use the OSX calendar app to plan my meetings. I would like to know if there is a way to hide the event info when I am showing my calendar to someone.

Here is a practical example.

I am with a client and I have to plan our next meeting, so I open up the Calendar app to see when I am available. Since the client will be looking at the computer too, I would like to hide my calendar info and just have colored boxes where I am not available. Ideally this would be a toogle, so that I can enable this "privacy mode" when I am with a client and disable it the rest of the time.

Any ideas?