Just a sample site of a possible usage of DateTimeExtensions nuget package.
January 01 New Year
March 01 AshWednesday Observed
April 13 Good Friday
April 16 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