If you hear people saying something that sounds like "how do", they're not asking how you're doing, they're just saying goodbye. Spelled '"houdoe", this is the common word when saying goodbye in the provice of Noord-Brabant. Where it comes from? I don't know.
In February/March we celebrate Carnaval in Tilburg.
This starts at Friday with a "dweil-tocht". Lots of people hop from one bar to another and drink beer and "schrobbeler". Most people wear a costume, so during carnaval you can see elves, angles, devils, farmers, nurses, monsters, etc. etc.
On Saturday there is more beer-drinking and all sorts of festive activities.
On Sunday there is "d'n Opstoet". This is a parade of big wagons and dressed up people. Most jokes that are made in the parade can only be understand by locals. The phrases are usually in Tilburg-dialect.
Monday and Tuesday are also celebration-days, but on Wednesday the Carnaval is over. Usually this is celebrated with "haring happen": people eat the raw fish and flush it down with some more beer.
Tilburg is in the south of the country, meaning it is mainly roman-catholic. This religion is reflected in pompous abbeys and churches.