Contrary to popular belief, the stock market is not closed for Columbus Day.  Here are the NYSE holidays for 2008-2009:

2008
Thanksgiving Day, November 27
Christmas, December 25

2009
New Year’s Day, January 1
Martin Luther King, Jr. Day, January 19
Presidents’ Day, February 16
Good Friday, April 10
Memorial Day, May 25
Independence Day, July 3 (observed)
Labor Day, September 7
Thanksgiving Day, November 26
Christmas, December 25