In Mugon mairi, it is believed that one's wish will be fulfilled if one visits the otabisho seven nights without having communication with others while the mikoshi stays in the otabisho.
神輿の御旅所駐輿中に、誰とも言葉を交わすことなく御旅所を七夜お参りすれば、願いが叶うというのが無言参り。