Hi Christine Yang
It is safer to wait for their email before you book your flight and accommodation. Based on their info session schedule page, they clearly indicate the following:
"Important: We do not allow registrations from non-residents/non-citizens without written authorisation from our office. If you want to travel to another country for an information session and you want to use this participation towards your eligibility for NBPNP, you should email us with your profession and language test results in the email body and a full resume in attachement at: promotions@gnb.ca >>>Please do not make travel arrangements before receiving a confirmation from our office, we will respond only to people who we will invite so if you do not receive an answer it means we do not believe your attendance will generate an invitation to apply based on your profession (check Table 1 in the Eligibility Requirements page)! "
You have to receive a confirmation email from them allowing you attend the session with the location details and timings. If you didnt hear from them, it wouldn't hurt I guess to follow up or resend your email with the required documents.
Best of luck and may you receive their reply in no time.