The Day of the Dead in Mexico traces back to the celebration around the Aztec goddess Mictecacihuatl. She was the Queen of Mitclan, the underworld. She was thought to have been sacrificed as an infant. In Mexican culture the Day of the Dead is celebrated on November 1 & 2. On the 1st, they honor children and infants, and that day is sometimes referred to as the Day of the Innocents. On the 2nd they honor dead adults. Sometimes they build altars in the cemeteries of their dead ancestors. They also use the Flowers of the Dead to get their attention. The holiday symbol is a skull, sometimes with a mask.
But what does the Bible say about this?
The dead praise not the LORD, neither any that go down into silence. Psalm 115:17 The dead are dead....