The Belgians do commemorate Armistice Day on November 11th. It is not a Dutch holiday because the Netherlands remained neutral during WWI.
The Dutch celebrate St. Maarten in more or less the same way as Halloween is celebrated in Anglosaxon countries (trick and treat). I do not know too much about Sint Maarten other than that he was a very generous guy who shared his mantle with a beggar when it was freezing cold. You can read more about him at http://www.meertens.knaw.nl/meertensnet/...
. This is a website of the Meertens Instituut, which contains a wealth of information about Dutch customs. Unfortunately, all information is in Dutch.
Allerzielen and Allerheiligen
This week, we had two public holidays in Belgium, one commemorating the deceased, the other all saints: Allerzielen (All Souls) on October 31st and Allerheiligen (All Saints) on November 1st.
It is said that Halloween grew from 'Samhain' (Celts), 'Pomona' (Romans) and 'Allerheiligen' and 'Allerzielen' (Christianity) so it probably no coincidence that Allerzielen and Halloween are celebrated on the same day.
On Allerzielen Day, people visit the graves of family and friends. The entrances to the graveyards are cluttered with flower sellers. On All Saints Day, people go to church and visit their relatives (the ones who are alive).
Allerzielen and Allerheiligen are no public holidays in the Netherlands but they may be celebrated in the catholic south (Noord-Brabant and Limburg).
Soon, we will be celebrating Sinterklaas (December 5th). This is one of the most important holidays in the Netherlands. We have a lot of Sinterklaasliedjes (songs), which will be posted in the Dutch Hoekje.