I had about 50% attendance at my 8am games this year. Last year I had maybe 1 or 2 slots out of 8 not show. As @brendar pointed out I think this is partly some registration issue hangover. I don't think this was malicious double booking. I did that when I submitted events because I wasn't sure what I was gonna get (gaming the registration system in a but I fully expected to not get half of what I wanted). However, for those events that had overlap I returned those tickets or made sure that they were being used. I'm still gonna run my events at 8am next year (well, maybe run one at 10am so the late night folks could more easily make it). However, I had at least 2 folks that commuted to the con (because they live nearish by) make the 8am game (one was teenager). I trust in the con organizers to get a better registration system next year so that we either don't have this problems or they are rare.