So the list of people working on major holidays includes those working in:
- Emergency services (police, fire, ambulance).
- Some medical services (hospitals and nursing homes where monitoring patients is necessary or there may be emergencies).
- Religious services if the holiday is based on their religion.
- Hotels.
- Airlines and other travel services.
- News and some entertainment, including some professional athletes.
- Utilities in case of outages.
- Military (watching for attacks or other situations of interest).
- Support services for all of the above.
Others?