please, go to the news sections, the breaking news thread and the blogs posted on the Home Page of this site for more details. All the information out about the HQ Live is listed up there.
you have the possibility to subscribe for a session, but it does not guarantee you to take part it just brings you into the draw of being invited. So patience and some lucky thoughts are virtues on this one. Anyways, I hope you can make it, as for us Europeans we have to take the live stream, which is just a wonderful thing... =)