Can someone else set up a stall at the school gate?

You can't. According to the query "Suggestions on prohibiting vendors from setting up stalls at the school gate and maintaining the school environment", it can be known that setting up stalls at the school gate will affect students' food safety and traffic order, and it is forbidden to occupy roads and set up stalls in the surrounding areas of the school. A school refers to an organization in which educators systematically educate the educated in a planned and organized way.