if you want cold dishes, you have to serve them once every three people. That's five. Cold dishes can also be meat. Hot dishes should account for 8% of the total dishes. If there are five cold dishes, order about fifteen hot dishes. Twenty dishes for fifteen people is not much. Depending on the situation, everyone's appetite may increase or decrease. If everyone drinks, it will be further. You can drink. You can't choose more than one food. Another 2% of all vegetarian dishes can also be decided according to the situation. If you have staple food, order it yourself. After all, there are twenty dishes there. Whether the staple food can be eaten depends on your appetite. Finally, the most important thing is to ask everyone's taboos. Another suggestion is that if 15 people order, don't order more than a dozen pieces of meat on a plate, for fear that it will be gone as soon as it comes up, and some people haven't eaten yet. . . In fact, the easiest way is to order seven people and then order a double. Whether 15 people sit at two tables or 15 people sit at one table. When serving, some dishes will not disappear at once, just like attending a wedding reception in the countryside.