All three of the games I'm running sold out immediately.  Is there someplace I can see a list of attendees?

Yes. You can either go through you EO/GM Dashboard, or just go to the event and scroll all the way to the bottom. You'll see a list of attendees there.

Thanks.

It used to show lists from previous years when I would search my previous years events in the dashboard, but now the list of attendees at the bottom is gone for my previous Gen Con events. Is that a space/data saving issue or did something change?

I liked being able to notice names of previous attendees who have returned to play in my games again.