Have each wrestler decide on a name for themselves.
Explain the match to them. Here is what they do
Gyoji referee introduced them by holding the fan over each head not provided and saying the name of the wrestler.
Wrestlers move to opposite sides of the ring and show their strength to each other by grunting, growling, clapping, and stomping.
Gyoji starts the match by dropping the fan and yelling SUMO.
A winner is declared when one wrestler knocks his opponent out of the ring or off their feet.
If time allows you may want to run a best of 3 matches.