Disney is running the Year of A Million Dreams Sweepstakes and giving out prizes throughout Ak, MK, MGM, Epcot, Typhoon, Blizzard and Downtown Disney. The Prizes are a part of that.
If you have someone that looks like the 2 guys (could be girls too) on the right approach you (Khaki pants, blue button up shirt and a whit vest with the YOaMD logo on it)... DON'T turn them away. This is the prize team

The majority of the prizes that they have are Pin lanyards with pins, Dream Mickey Ears and Dream Fastpasses, but they "could" have one of the big prizes. It is good of you to ask though cause a lot of people think that if they take the gift they will have to take a DVC tour or something, they don't understand it is a part of the sweepstakes.
Good Luck to you...
If they do not have the white vest on they do not have prizes, the other half of the team wanders the park and talks to people. They are super greeters. So if you run into one (whith Khakis and a blue shirt, but no vest) they are just making sure your day is going well, they will not have an sweepstakes prizes to give out.