Claim your date! Winner is the fist person to pick the exact correct date. If nobody does, winner is the person who picked the closest preceding date first.
"Formally Announced" = press conference by BYU or Big 12 or article on an official BYU or Big 12 website.
If it is never announced, we all lose, so don't bother trying to claim "never."
Edit: entries invalid if made on or after the date of announcement.