Yobidashi

The yobidashi (呼出 or 呼び出し) (announcer or beckoner) calls a professional sumo wrestler, or rikishi, to the dohyō (wrestling ring) immediately prior to his bout. He does this by calling the name of each wrestler fighting in turn whilst holding a traditional folding fan.

 In keeping with their workman outfits the yobidashi are actually the Sumo Association's handymen, or odd-job men, and have a wide variety of tasks. These include on match days: sweeping the ring, providing purification salt and ensuring that during a bout no wrestler injures himself on the bucket of chikara-mizu (power water) situated at one corner of the ring...

...The yobidashi also build the clay wrestling ring (or dohyō) for tournaments and display competitions, and rings for the training stables. There is also a tradition of the yobidashi writing songs, called jinku, based on sumo life.