If you like beer, check out "The History of Beer in America" presented by Samuel Adams. It was fun and informative and you end up with what amounts to about 2 glasses of beer.
Also, the culinary demonstrations are very easy to get into in the evenings. They always include a sample-sized portion of the recipe presented and a copy of the recipe.
The South African cultural representatives present slide shows and seminars about their home country, which are always nice, and of course, as mentioned in the previous posts, Eat to the Beat usually has some fun acts.