All I know is I was able to make a 2 for 1 res using the Gold Elite offer for a Marriott on Feb 19-21, 2010. The cs agent checked for the offer and also whether the hotel I wanted ws participating.
It really shouldn't be so difficult to let us know the dates for these things. The only thing worse was when we had to wait for them to be delivered via snail mail. Sometimes I wonder who's running the marketing department and why this is so difficult.