Often confused with Halloween and All Saints' Day, November 2 marks the Day of the Dead, also known as El Dia de los Muertos, a commemoration of death to mark the passing of our loved ones.
" The Halloween is a ritual practiced in many cultures and religions, which often dedicate one or more public holidays to the commemoration of the deceased. […] For the Roman Catholic Church, November 2 corresponds to the Commemoration of the faithful deceased, celebration of the dead through masses, in particular for the deceased of the past year. The Mass has a value of purification from venial sins in order to reach the beatific vision. This festival has a monastic origin: it was, in fact, celebrated for the first time at the abbey of Cluny, under the abbey of Odilon (994-1049) who instituted it. This day is traditionally devoted to a family visit to the cemetery and the maintenance of the graves. "
Source: Wikipedia
In North America, this celebration is somewhat forgotten, to the detriment of Halloween, of Anglo-Saxon origin.