I am a special guest for AthensCon, December 2 & 3, a convention which last year had 15,000 attendees. My duties/events include (besides having fun and eating gyros):
Running a two-hour RPG workshop: The Genius of Original Dungeons & Dragons:Leaping Outside the Box of Design History.
Participating in a large panel discussion on board game design.
DMing two sessions of my redesigned Lake Level from Castle El Raja Key, a level Gary Gygax cut his teeth on during the play-tests of D&D in 1973 and which was later incorporated into Castle Greyhawk as the "Black Reservoir." I have greatly expanded it to two maps with the commensurate encounters and added a back history and living depth to it. Should be a riot!