Tales of Tolgard
Fight clubs are fairly common events all over the Material Plane. The are technically secret events, but they draw such crowds and bring so much money into local communities, that the local guards all get cricks in their necks from looking the other way.
Fight clubs are basically gathering of spectators to watch and bet on different bouts. These battles tend to occur behind closed doors and often underground. Anyone can participate in the fights and the house usually gives odds for gambling. The fights can be either lethal or non-lethal depending upon what the battlers decide before the bout.