Both the wine and culinary demonstrations/seminars tend to fill up rather quickly. The nice part about the Sam Adams beer seminar is that it is an ongoing event throughout the entire Festival, so you can usually get into that rather easily.
The culinary demonstrations in particular are usually one-time only with a rotating schedule of WDW or guest chefs. When you arrive at Epcot they will have brochures available with a full schedule of all demonstrations.
The private dinners are EXTREMELY limited in seats and even harder to get reservations for. Last year, there were three different types of dinners:
1. Party for the Senses - This is a grand buffet type dinner, and the easiest of the three to get into as there is room for a few hundred guests. The Party we attended last year was fantastic as it included approximately 20 different food tasting tables and approximately 10 different wine booths. I highly recommend this event to anyone!
2. Signature Dinners - Very difficult to get into, as seating is limited to around 25-40 for each dinner. Each dinner is themed, with guest chefs preparing a 5-7 course meal. Winery representatives join you at the dinner, pairing some of their best selections with each course. We attended two last year, South African wines at Jiko, and Sonoma wines at California Grill. Each was fantastic, the Jiko dinner was out of this world. Cost for these dinners was $100 per person.
3. Reserve Dinners - As above, very difficult, seating limited to 25-30. As with the Signature Dinners, the Reserve Dinners are themed, with guest chefs and guest wineries pairing a 6-7 course meal. The major differences between the two are:
- Reserve dinner includes Reserve bottles (more limited production, typically better quality) of wine
- Reserve dinners are at the Wonders of Life VIP dining room, Signature dinners are held at specific restaurants
- Reserve dinners include VIP seating for the IllumiNations fireworks display following dinner
- Reserve dinners are $150 per person
The dinner we attended last year was the Pacific Northwest, and was simply amazing.
I still have the menus for each of these events if anyone is interested.
One last thing, I agree with the previous poster about the WS getting crowded at night. We much preferred walking the World for lunchtime to taste at the booths.
Enjoy!