In addition to the 10:01 a.m. ceremony—which echoes the park's original dedication ceremony—Epcot is installing a special exhibit in the south corridor of Innoventions West near the character greeting location, distributing commemorative buttons to all park guests, and adding a special ending tag for the evening's showing of Illuminations. The tag will feature well-known Epcot music and the voice of Walt Disney, most likely from "The Epcot Film," and will include perhaps as many shells in the closing seconds as the show's entire holiday tag.
"Retro" guidebooks, menus and other souvenirs will also be involved in the event. The Innoventions exhibit will be in place through at least the end of the year; we'll bring you photos from the exhibit in the October 8 Park Update.
Also, park guests will have the opportunity to chat with Imagineering Ambassador Marty Sklar in the Circle of Life Theater inside The Land pavilion, though seating will be limited. World Showcase restaurants will also get into the act, providing menus reminiscent of the original 1982 menus.
