The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.
https://www.eventbrite.com/e/dyslexia-and-drug-use-hiding-in-plain-sight-tickets-35512193928?aff=utm_source=eb_email&utm_medium=email&utm_campaign=new_event_email&utm_term=eventurl_text