Day of the Dead is a giant festival in Oaxaca and surrounding towns. The "official" dates are Oct 31-Nov 2, but you'll find events from Oct 29 through Nov 4. There are many activities, from parades and comparsas to events at cemeteries. Most Mexicans also build an altar in their homes to remember and welcome the ghosts of loved ones that have passed on. The altars are usually decorated with leaves and red and gold flowers, photos of the loved ones as well as their favorite food and drink.