The main special event for the 4th is special fireworks at MK and Epcot, usually adding some special patriotic finale to the usual show. The Electrical Water Pageant also has a special Independence Day show, viewable from the Magic Kingdom resorts at night. In addition, the parks are often open longer (both in the morning and at night) to cope with the increased crowds. I don't have any specific timings for any of these, but the official WDW website is one of the best places to look. :wave: