The monuments of the Dong Co Temple today lie on high ground, overlooking the To Lich River. The temple was built in 1028 under King Ly Thai Tong. Dong Co Temple is for worshiping the Dong Co god. In fact, Dong Co means the bronze drum, so this is the temple of the bronze drum.
On the day of the festival, on a high altar, surrounded by flags, spear and people, in the center of the altar is the altar of Dong Co god, the incense burner and mandarins attending the festival. The mandarins coming from the east went into the temple, came to the front, kneeling before the god and read the vow "Not to be disrespectful toward parents, not being a traitor, the god witnessed this". Later, because the festival coincided with the date of a Ly King, the vow was passed on April 4 of the lunar calendar. The Ly dynasties are all for the annual vows. Participants in the festival are not only people of Buoi area but also many people in the other areas.