Dia De Los Muertos
Day of the Dead is a holiday celebrated throughout Mexico, and by people of Hispanic ancestry living in other places, especially the United States. It is acknowledged internationally in many Latin American nations.
The Day of the Dead is all about celebrating deceased loved ones so dressing up is probably a good idea because your beloved departed loved ones are there with you in spirit. We all have to look nice.
I've never been a fan of skeletons, perhaps because they are such straightforward symbols of death. Todos Somos Calaveras.