Just a sample site of a possible usage of DateTimeExtensions nuget package.
January 01 New Year
March 05 AshWednesday
April 19 Good Friday Observed
April 21 Easter Monday
May 24 Labor Day Observed
August 02 Emancipation Day Observed
August 06 Independence Day
October 18 National Heroes Day
December 25 Christmas
December 27 Boxing Day Observed
DateTimeExtensions DateTimeExtensions