It is located in the Ciudad de los Deportes colony in Mexico City, next to the Estadio Azul (Blue Stadium). It can seat 41,000 spectators, but it's had over 50,000.
It is used almost exclusively for concerts and bullfights. It has a 43-metre diameter ring and a 2-metre wide alley (callejón). It's commonly known as La Monumental or La Mexico.
It is privately owned. The bullfighting season, called Temporada Grande, starts every year between the last Sunday in October and the first Sunday in November.
It lasts a minimum of twelve fights, almost always extended to twenty. There is also a season for training fights called Novilladas, with fewer spectators, held annually in the summer and lasting twelve fights.
According to mexico.city-tour.com