Scott, the Festival of Speed is June 25-27, 2004. The Revival is September 3-5, 2004. No period dress requirement at the FOS. As far as the Revival, you'd be surprised...Cal or Paul can tell you better what they will/will not accept in the paddock. Based on the photos I've seen this year, anyone dressing like Sherlock Holmes, a WWII fighter pilot, a WWI doughboy, any member of the Beatles, or Laurel/Hardy is a lock to get in. Cal apparently went dressed as Mary Poppins, but that's another story for another day.
Bob