Related to "Día de Muertos" or "El Día de los Muertos"?
I understand when to use one or another but I can't articulate the reason.
For "Día de muertos" or "Fin de semana" we don't add "los" (Día de los muertos) or "la" (Fin de la semana), but we do add it for the mothers day "Día de las madres" (also I do understand what "Día de madres" would imply, "A rough day").
Just curious if someone can shed some light on how to explain it.