Why is it necessary for all married Chinese couples to hold wedding banquets?

custom and cultureWhy is it necessary for all married Chinese couples to hold wedding banquets?
It is not a necessity to hold wedding banquets, you don't have to if you don't want to. Traditionally, marriage is a big thing to Chinese people/culture, and happens only once in a life time. (Chinese very rarely seen divorced, even if marriage goes horribly wrong) Wedding banquets also lets you reap in money for a newly wed, via money gifts from parents, relatives, and whoever you invite, and the money is used to set up the life for the newly weds. (It is often the case that you make a profit for a wedding from all the money you get from gifts than to open a banquet) Nowadays, you can just go to a marriage court and get pronounced husband and wife without having to worry about banquet, and get divorced that way as well.Why is it necessary for all married Chinese couples to hold wedding banquets?
although i am not chinese, my nationality is vietnamese. and whenever someone gets married in our culture we also have a big feast. it is more about traditions and long time customs but i think it's more of a way to bless the newlywed couples. they have a festive feast to send them off on their way towards their marriage. but before the feast takes place there is a ceremony held at either the bride or groom's house to give their parent's blessings to each other and to pray to their ancestors so they can have a successful life and marriage.