The ID of the Sendgrid email template to be used for the confirmation email when a user completes the registration form for the conference. This can be found in the Email API > Dynamic templates section of Sendgrid
You must copy the template ID exactly or it the user will not recieve thier confirmation email!
Example: d-e292ab26a0a148e2823ee99e4bead30c
Will use the generic Forumm registration email if this is not specified.