I always thought that they should consider using the Holidays as a way to include the diversity of the state into the park.
Disneyland has the big Christmas season showcased as most americans see it. DCA could extend the Holiday feel and look by showcasing how the many diversities of people in CAlifornia celebrate the Christmas Holidays.
If done correctly it could be an extension to the small cultural displays/events they do in Disneyland throughout the year. these include Cinco de Mayo, three kings days, Day of the Dead, Chinese New year etc