I was driving the whole day, had a couple hours of sleep and woke up midnight to answer the questions for my pre-recorded talk, get the talk cancelled by faulty HDMI :)
No blame, hardware failures happens and I understand that SeaGL is primary offline event, but I would suggest to take a look at wonderfully organized EmacsConf and borrow some great parts from it (including sound checks in advance, keeping in touch with speakers before and during conference, etc).
@abcdw
Will you be posting your talk? I was looking forward to it.