2)The website says that applicants from India will not be authorised as they will be conducting a session in India soon. Still, I have received an invite. Well, it's a risk worth taking. As they have approved your attendance, I feel you should go for it!
You have to make sure you send an e-mail to promotions@gnb.ca and receive an authorization before you travel to attend a session. Unless you hear back, dont make arrangements for travel.
Anybody who registers gets an e-mail with the venue and time for the session. It doesn't mean that they approved to attend the session.