I'm told the event is filling up, so if anyone unconfirmed still wants to go then please rsvp Tesla now.
Pre-requisite is that you must have already received your car, and bring your Model S to the event. Of course, if you just want to turn up and see what's going on (or be a +1), that should be fine.
P.S. Today I've got my vouchers for the TEDx event (via eMail). If you've registered, but don't get your vouchers by tomorrow, I suggest you contact Tesla HK to confirm.