Every week wrestlers fight out in a small stadium in Khartoum. The tradition comes from the Nuba Mountains, further south in Sudan, and the wrestlers are all originally from the Nuba Mountains.
In Khartoum, this is probably the best entertainment you can get. One thing are the fights itself, but the other attraction, would be the crowd. They are so into this, and they yell, scream, dance and sing. If their favorite wins, they go crazy. But the same happens if he's defeated. Then they will scream; fraud, cheating! Sometimes the police have to calm them down.
To find the arena, just ask in your hotel or take a cab.