There was bad news late at night. 50,000 people were trampled and more than 300 people were killed and injured. The scene was in a mess. Recently, a large-scale trampling accident occurred at a music festival in Houston, my country. Many people were injured and others died as a result. When the accident happened, a rapper was performing. This singer often incited the audience when performing. According to the information released by the Chinese police, besides the stampede accident, there are many problems in this music festival. Not only did some people bring contraband into the festival, but almost no one wore masks. In the absence of effective control, doing so will obviously cause widespread infection.