I think the "Taste of Gold' is a program where Marriott extends Gold status for a promise of so many nights over the next few months. I think Marriott Rewards customer service is the group that monitors/offers the program. If you call or e-mail customer service I am sure they can let you know if they are currently engaged in the program offer and the details about it.
Hope this helps.
tef is right. You will get the "Taste of" status level for about 3+ months (usually 3 months plus the rest of the month you start the challenge in, so you can have almost 4 months), and if you meet the challenge for the number of nights that you need to stay, then you get to keep the status for a full year(and the rest of the year that you started the challenge in). During the challenge period you are at the level that you are trying to move up to. They also have a taste of Platinum as well, and you don't have to only go up one level. As a Silver, you can do a taste of Platinum. The number of nights you need to stay during the challenge period is higher to make and keep it. Hope this helps.