As previously stated in Clearing House advisory 05-65, in December 2003 for the Live Cattle contract, CME Inc. introduced "blackout" days at the delivery point. Clearing member firms were advised that the Deliveries System would prevent "sellers" from tendering deliveries that would occur on an auction day so that deliveries would not interfere with the auction and vice versa.
  
Effective immediately, Guymon, OK has informed CME Inc. they will no longer hold auctions on Mondays. Therefore, Guymon, OK will be eligible to accept CME cattle on this day. The following is a revised schedule of "blackout" auction days.

Clearing member firms will be informed well in advance if one of the live cattle delivery points will have a "special" auction day other than the one listed.

For the full text of this advisory...