IMPORTANT NOTE FOR ADMINS
If you do not LOG IN under your own account, the system will assign the first registration and its invoice to the contact associated with that email address, assuming it already exists in the database.  If you use the same browser session to make subsequent registrations, then invoices will be assigned to the email of the first registrant as the main contact for all subsequent registrations.  To avoid this, close your browser after each registration or log in before registering.