Different referral links

This is a ticketing page that shows select ticket type(s) based on the referral link to this event page.

Only show Ticket Type 1: 
https://events.liveit.io/customdemos/varied-visibility-demo/?referrer=promoter-a 

Only show Ticket Type 2: 
https://events.liveit.io/customdemos/varied-visibility-demo/?referrer=promoter-b 

Only show Ticket Type 3: 
https://events.liveit.io/customdemos/varied-visibility-demo/?referrer=promoter-c 

If a customer is being clever and remove the referral affix, no ticket types would be shown: 
https://events.liveit.io/customdemos/varied-visibility-demo/