Runway Usage at JFK on Dec. 13

I was surprised that the usual runway change made daily around 1250 at JFK never happened on Dec. 13. I suppose there were problems with the 31's as they stayed on the Rwy. 4 configuration all day. The wind was not a factor as it was light. I was visiting and noticed the tower lit all in blue. Any reason for blue? Is it for the holiday?

JFK tower has been blue for many months now, no?

That runway change isn't a real "scheduled" thing, it's just something that happens, and is all weather and construction permitting.

Yesterday, runway 13R/31L was closed for repairs until 3pm.