substitute national holiday; day off in lieu of a national holiday that falls on a Sunday; compensatory holiday; compensatory day off work (for having worked on a holiday, etc.)
holiday allowance; allowance for working at weekends or on a holiday
citizen's holiday; by law, any weekday that falls between two other national holidays (e.g. September 22, falling between Respect the Elderly Day and the Autumn Equinox Holiday)
legal holiday; bank holiday
compensatory holiday (for working on a day off)