In fact, the performance on the seventh day after death is just the curtain-opener for the Soul Guiding Chen. The full ritual is not played out until the eve of the carrying out of the coffin, which takes place on a day selected because it is auspicious for funerals.
「頭七」只能算是牽亡陣的一場序幕，正式的演出要到出殯前一晚才會登場。