It’s definately off topic, but I’m not sure it’s such a bad thing to post it here either. Mods will know what to do.
Anyway, why not simply advertise it at opengl.org’s news page ? More people would read the invitation.
Hope to see a report. The presentations are normally available a few days later, but the interessting things like non nvidia talks (Crytek, Intel,Microsoft), party infos (Images) and behind the scene talks (and that could be ontopic ;-)) could be posted here.