On November 1st the Catholics celebrate All Saints' Day (DГa de Todos Los Santos). According to the Roman Catholic Church canon, all believers must attend mass on this day. The next day, November 2nd, is the Day of the Dead (DГa de Muertos), when it is customary to visit graves of passed away relatives and loved ones.
The first remembrance service of all saints, known and unknown, took place in the 8th century, thanks to Pope Gregory III. In the 9th century Pope Gregory IV made the 1st of November a holiday for all Catholics.
Because Catalans also celebrate CastaГ±ada (Castanyada) between November 1st and 11th, the traditional fare for the All Saints' Day and the Day of the Dead in Catalonia is chestnuts, baked sweet potatoes and traditional sweets, panellets.
The day before All Saints' Day, October 31th, is Halloween, a beloved holiday in many countries that had been tied to the All Saints' Day historically, but nowadays can hardly be called religious.