I have to give performance reviews for my employees soon. I know everyone hates getting (and giving) these, so I was wondering if there was a way to make them more enjoyable. How do you get your employees to relax during these?

I have to give performance reviews for my employees soon. I know everyone hates getting (and giving) these, so I was wondering if there was a way to make them more enjoyable. How do you get your employees to relax during these?