Where do people celebrate this day? In Mexico and other Latin American countries.
What do people do to celebrate this day? They celebrate by playing their family members' favorite music and eating their favorite foods. They go to their graves to set up flowers. And they make shrines in honor of their loved ones that died.
What do they put on the shrines? A glass of water for the spirits who had a long journey home, so they'll have something to drink. Paper flowers to blow in the wind. They want something to represent all the elements of the earth: earth, wind, water, and fire. Also their favorite food or things they liked. And a picture of the person.