What Is a Blind Bird Ticket?

I’ve been reading lately about events and conferences selling “Blind Bird” tickets. It seems like it stemmed from “Early Bird” and upon searching the term “Blind Bird Ticket” in Google, only more Blind Bird ticket sales came up. No official Wiki or definition whatsover.

Buying a Blind Bird Ticket means that you’re entitled to a hefty discount (much like an Early Bird) at an event without further details yet – such as to who will be speaking or doing the intermission numbers.