Just a sample site of a possible usage of DateTimeExtensions nuget package.
January 02 New Year Observed
February 08 AshWednesday
March 24 Good Friday
March 27 Easter Monday
May 23 Labor Day
August 01 Emancipation Day
August 07 Independence Day Observed
October 16 National Heroes Day
December 25 Christmas
December 26 Boxing Day
DateTimeExtensions DateTimeExtensions