<p>I had mine, from the Seattle area. Got a response the day after I submitted. Honestly, like what tankfrank said, its not a big deal. I was actually kind of mad that I got invited to one. The way I looked at it, doing well on the interview won’t really help you, but performing poorly will. However, even though they emphasized that they were optional, I still felt like declining it would raise a red flag. So basically you have to go if you get an invitation and have to do well, but no good comes of it. </p>