This is a local custom, which is quite common in rural areas. It is not easy to be a college student. Therefore, there are many cases in which parents hold banquets. But this is also their love, and we should understand them. Actually, it doesn't matter whether they do it or not. The important thing is that they have been admitted to the university, and this happy mood can be shared by everyone. If you can think like this: "Everyone knows that I have been admitted to the university, then I will work harder and live up to everyone's expectations." That's better.