Just a sample site of a possible usage of DateTimeExtensions nuget package.
January 01 New Year
March 09 AshWednesday
April 22 Good Friday
April 26 Easter Monday Observed
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