Most museums adopt Sunday hours on public holidays (except Christmas and New Year, when they close) even if they fall on a day when the place would otherwise be closed, such as Monday. Many people treat Remembrance Day (4 May) as a day off.
Carnaval is celebrated with vigour in the Catholic south. Huge parties are thrown in the run-up to Shrove Tuesday and little work gets done.
Nieuwjaarsdag (New Year's Day) 1 January. Parties and fireworks galore.
Goede Vrijdag Good Friday
Eerste Paasdag Easter Sunday
Tweede Paasdag Easter Monday
Koningsdag (King's Day) 27 April (26 April if the 27th is a Sunday)
Bevrijdingsdag (Liberation Day) 5 May. Not a universal holiday: government workers have the day off, but almost everyone else has to work.
Hemelvaartsdag (Ascension Day) Fortieth day after Easter Sunday
Eerste Pinksterdag (Whit Sunday; Pentecost) Fiftieth day after Easter Sunday
Tweede Pinksterdag (Whit Monday) Fiftieth day after Easter Monday
Eerste Kerstdag (Christmas Day) 25 December
Tweede Kerstdag ('Second Christmas' aka Boxing Day) 26 December