Weekends are usually busy, especially Saturdays at MK. It's million+ locals that live within driving distance that boost attendance. Ecpot can easily handle the local crowd increase.
The Food And Wine festival runs all day everyday from early October through mid November. The dates seem to change each year. It's great time, good food and very good drink. There are booths set up all around World Showcase highlighting food and drink from various countries, Ireland, Greece, Spain, Poland, Peru, India, etc. There are also musical performance by has-been bands like, Chubby Checker, Eddie Money, Three Dog Night, The Beach Boys, etc. All this is included in the standard Epcot admission. However, they do offer specialty seminars and dinners which cost extra and usually require advance registration.