thehowiet
Wilson King of Prussia
I remember reading in one of the books about building Walt Disney World that they intentionally had the official grand opening ceremony weeks later as not to have a repeat of the disaster that was the opening of Disneyland. This gave them a few weeks before all of the press events to get everything up to speed and avoid some not so great reporting by the press as they worked out the kinks. This was another reason behind them opening in October and not the busy summer months.The parks blog site mentions it
Vintage Walt Disney World: A Dedication with Style at Magic Kingdom Park
Walt Disney World Resort opened its doors to guests on October 1, 1971, however the official grand opening and dedication took place on October 25, 1971. The dedication plaque was read aloud by Roy O. Disney with Mickey Mouse at his side.disneyparks.disney.go.com
I believe the book I'm thinking of is Realityland: True-Life Adventures at Walt Disney World.