It didn't happen last year. The week before and after were blacked out. The last round of AP discounts end on March 30. The next round should start on April 15th. But, of course, you really never know. If there are rooms that need to be filled, then a discount could be released. However, if it was me, I would be planning on paying full price. There was a thread of folks waiting for late March and early April discounts, but I think they gave up and the thread died.