One of the most important of Lao customs is the marriage ceremony, called the Baci / Sou Khouan, a tradition that characterizes the uniqueness of the Lao culture.

The Sou Khouan appears to have become more of a cheerful formality than just a simple ritual. Aside from performing this ritual at weddings, this kind of ceremony is also performed for other important events such as housewarming, farewell to travelers, greeting family members or relatives after a long absence, births, deaths, honoring achievements, and recovery from illness. Only a few Lao would dare to experience such vital life events without engaging in this ceremony of blessings and well wishing.

It is believed in a traditional Lao marriage ceremony that customs and traditions must be adhered to ensure a happy and long lasting marriage. Also, by having a traditional ceremony, Lao newlyweds demonstrate their respect for and interest in preserving their cultural heritage. The length of the wedding festivities is determined by the financial means of the families of the bride and groom; however, most last about one day.