Now that Thanksgiving's over, it's time to start thinking about December holiday shopping. And a grand tradition of December in the city is the annual holiday window displays at the huge Marshall Field's store at 111 State Street. This year's theme: Roald Dahl's "Charlie and the Chocolate Factory." Eleven windows along the State Street side of the store have been decorated with scenes from the book in the style of the book's illustrator, Quentin Blake. The windows will stay up through January 4, so you have quite some time to see them.