In Catholic parts of the country, it used to be common to attend Christmas Eve midnight mass; this custom is upheld, but mostly by the elder generation and by fewer people every year. Christmas Eve is these days a rather normal evening without any special gatherings or meals. On Christmas Day, throughout both Flanders and the Netherlands elaborated meals are prepared by the host or together as a family. Also meals of which every participant / guest is preparing one dish are very common. Christmas decorations start appearing in stores right after Sinterklaas. The week before Christmas is important to the retail trade, because this is the biggest sales week in the country. Christmas songs are heard everywhere. The cities of Amsterdam, Rotterdam, The Hague and Eindhoven are the busiest cities in terms of entertainment on Christmas Day. Traditionally, people in the Netherlands and Flanders do not exchange gifts on Christmas, since this is already done during a separate holiday (Sinterklaas) a few weeks before Christmas. However, more and more people have in the 2000s and 2010s started to give presents on Christmas as well, possibly under the influence of commerce and that from other countries where Christmas is celebrated with many presents (notably the US). In the north / eastern, the West Low German part of the Netherlands, some people will blow the Midwinter horns from Advent until Epiphany.