Hiya Donna!
The Epcot World Showcase Wine Walk is available all year long!
To sign up, you go to one of three shops in the World showcase; Weinkeller in Germany, Enoteca Castello in Italy, Aux Vins de France and ask for a Wine Walk Passport.
The last time I saw the Passport was about $20 and that got you 6 2oz samples of wine at those three shops. That price and size is, of course, subject to change!
Now, you take that Wine Passport and your receipt around to those three shops and sample your wines. From what I have read, you do not need to use it all up in one day, so you can stretch it out during your trip.
Have a great time! The wines in Epcot's World Showcase are amazing!