Question

Even though each region in mexico celebrates day of the dead differently, what are things that they do have in common.

Answer 1

Each region in mexico has its particular way of celebrating the day of the dead.  They use different and local elements to celebrate it.  One thing in common in all of the regions is the use of an altar called "altar de muertos".  The decoration of graves is also a common practice.  In the 1930s during Lazaro Cardenas government, November 1 and 2 was the date set for all Mexican regions to celebrate the day of the dead.