Mexican Aztec/Christian Holiday ("Dia de Los Muertos") Decoration: "Calaca"

This Mexican mask is a modern version of masks worn in Aztec times to memorialize the dead.

"Dia de los Muertos," or Day of the Dead, started thousands of years ago with the Aztec, Toltec, and other peoples of Mesoamerica. For these ancient cultures, mourning the dead was believed to be disrespectful because death was a natural part of the life cycle. The memory and spirits of the dead were kept alive through various memorial days, religious rituals, and celebrations. Skulls were used to honor the dead. During celebrations, people wore costumes and used "caretas", or masks, to scare the dead away at the end of the festivities.

After the Spanish conquest, these indigenous religious traditions were absorbed into Catholic celebrations. Today, Day of the Dead festivities happen over two days to demonstrate love and respect for deceased friends and family members.
Source:
https://lammuseum.wfu.edu/2021/10/hispanic-heritage-month-decorate-a-day-of-the-dead-mask/#:~:text=Revelers today paint their faces,or keep the spirits close.