In the past, building a house was considered one of the three most important events in Vietnamese life. These were purchasing a buffalo, looking for a wife, and building a house.
So building an own house is very important to Vietnamese. It even shows his position in social structure. Vietnamese who die without ever has his own house is considered poor and disadvantaged.
 

Open house celebration is a popular customs of Vietnamese. All of friends, relatives and neighbors are invited to a party to share with the house owner happiness. After the party all guests give gifts normally a little money to house owner and also best wishes for health, happiness and a prosperous life.