Just a sample site of a possible usage of DateTimeExtensions nuget package.
January 01 New Year
February 09 AshWednesday Observed
March 24 Good Friday
March 27 Easter Monday
May 23 Labor Day
August 01 Emancipation Day
August 06 Independence Day
October 19 National Heroes Day
December 25 Christmas
December 26 Boxing Day
DateTimeExtensions DateTimeExtensions