I came across this sentence while reading last night:
La Día de los Muertos is the day when families hold reunions at the cemetery.
If you know Spanish at all, you probably know that there’s an error in this reference to the well-known Spanish holy day, the Day of the Dead.
Día is irregular in Spanish; though it ends in “a” it takes “el” not “la.” The correct form is El Día de los Muertos, and often, simply Día de los Muertos.
When you use words that are foreign to you, take special care to get them right.