The pre-bout ring-entering ceremony performed by top-division sumo wrestlers is called the dohyō-iri.
During the dohyō-iri, wrestlers in a division enter the ring in rank order, wearing their ceremonial keshō-mawashi aprons. They form a circle, face the audience, and perform a brief synchronized ritual before leaving the ring.
Yokozuna have a separate and more elaborate ring-entering ceremony. A yokozuna performs it individually, accompanied by attendants, and uses one of two recognized styles: Unryū or Shiranui. Therefore, dohyō-iri is the collective ceremony for a division, not the special dance of a grand champion.
The ceremony is ceremonial rather than competitive. The actual bout follows later, after the wrestlers’ preparation rituals and the referee’s formalities.