If so, the custom there is to hold separate banquets. The man pays for the banquet and the woman pays for the banquet. There is a betrothal gift, but it is usually double.
If your boyfriend is from Shanghai, the banquet should be accompanied by the man. No dowry, you can marry him casually ~
If the man leaves the house and writes your name, you can decorate the house, furniture and home appliances. If there is no name, the decoration should be done by men. You can only give movable things (that is, things you can take with you) as dowry.
But everything is negotiable, depending on the situation of each family. Nothing is necessary.