I went to one in Cancun about 6 years ago, if I remember correctly, they only do it one night a week. Wednesdays (?), and it's only during part of the year. I'd try to do a search and see. It was worth seeing.
3:30 pm on Wednesday. You can get off at the light just after km 0, Bonampak, cross the street and you can walk down Bonampak 300-400 yards and the Plaza del Toros is on the left.