The customer authorization (provided in the link you clicked) is out of date, and does not entitle you to use the Blended Threat service.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/nutrition-workshop-for-parents-on-childrens-nutrition-tickets-50323282292?aff=utm_source%3Deb_email%26utm_medium%3Demail%26utm_campaign%3Dnew_event_email&utm_term=eventurl_text