Is it useful to burn incense and worship Buddha and be vegetarian on the fifteenth day of the first month?

Yes, but it's too meager. I'll tell you a story: a great man went to the temple to worship Buddha on April 8 and set him free. He happened to meet a monk. The monk crossed his hands and asked him, "What are you doing here?" The great man said, "Do good." The monk asked again, "Why are you doing good today?" The great man said, "Today is the birth day of the Buddha." The monk asked again, "You didn't do good deeds until the Buddha was born, so shouldn't you do good deeds in the remaining 359 days?" The great man was ashamed to answer. At this time, someone scolded: "The noble protects the law, and the three treasures add luster. How dare I talk nonsense! " The wandering monk smiled and replied, "I have to tell the truth." Then turn around and leave. Mingyu, a monk in Wutai Mountain, once said, "If you concentrate on Buddhism, you will have malice. It is not a matter of merit to recite Buddha several times a day. Eat fat and sweet every day, and eat only a few days without meat. Can this be called charity? Can a few days without taking bribes be called incorruptible?