Please check that you are signed in using the email you used to purchase your CBA membership. Check this by signing in and navigating to your My Membership page using the membership menu.
Please check that you have not already registered for the event. One free or discounted ticket per member, per event is available. If you have already registered for an event, and attempt to register again, you will be charged full price for another ticket.
To check, navigate to your "My Events" area from the sign-in dropdown menu.