Black pig offering ceremony fascinates in Bắc Giang stockbot 0 6 03.30 09:45 https://vietnamnews.vn/life-style/1652983/black-pig-offering-ceremony-… + 3 https://vietnamnews.vn/rss/life-style.rss + 1 The black pig offering ceremony, also called ông Lang ceremony, was held on March 20. It is held to commemorate those who have made contributions to the village and to pray for favourable weather conditions and prosperity.