Empire State Building : Official lighting schedule

10/25/2010 - 10/27/2010 White/White/White ESB Lighting
10/24/2010 Purple/Purple/White Alzheimer's Association, 2010 Memory Walk
10/22/2010 - 10/23/2010 Red/Red/Red Scholastic, 90th Anniversary Celebration and "Read Every Day. Lead a Better Life." Campaign
10/21/2010 Yellow/Yellow/Yellow The Afterschool Alliance, Lights on Afterschool
10/12/2010 - 10/20/2010 White/White/White ESB Lighting
10/11/2010 Red/White/Green Columbus Day
10/08/2010 - 10/10/2010 Orange/Yellow/Red Publicolor, 15th Anniversary of Publicolor Day
10/04/2010 - 10/07/2010 White/White/White ESB Lighting
10/02/2010 - 10/03/2010 Pink/Pink/White National Football League, A Crucial Catch for Breast Cancer Awareness
09/30/2010 - 10/01/2010 Pink/Pink/White The Est�e Lauder Companies' Breast Cancer Awareness Campaign and Global Landmark Illumination Initiative

via. Empire State Building : Official Internet Site.

Also, its history.

1932: The first light to shine atop the Empire State Building (November, 1932) was a searchlight beacon which told people for 50 miles that Franklin D. Roosevelt has been elected president of the United States.

1976: Colored lighting was first introduced by Douglas Leigh. The tower was lit in red, white and blue in celebration of the American Bicentennial.