Binary Zero Day is a day to celebrate the bug that's so bad, it's good. A day to revel in the glory of a 0-day exploit that crashes your system and steals your lunch money.
A 0-day exploit is a bug that's so new, so cutting-edge, so utterly devastating that it's not even known by the vendor yet. It's like the ultimate surprise party for the security team.
So, if you're feeling lucky, and you want to crash someones system, then Binary Zero Day is your day! Just don't say we didn't warn you.