This is what we found on Wikipedia regarding the Monster Jam:

Monster Jam is a live motorsport event tour operated by Feld Entertainment. The series began in 1992, and is sanctioned under the umbrella of the United States Hot Rod Association. Events are primarily held in North America, with some additional events in other countries. Although individual event formats can vary greatly based on the "intermission" entertainment, the main attraction is always the racing, two-wheel skills competition, and freestyle competitions by monster trucks. Monster Jam is generally considered the largest, most famous, and most prestigious monster truck tour.