You must have seen a flea market for primary school students, which usually sells books or stationery that you don't read. However, you must look at this flea market that Bian Xiao wants to talk about. Pupils sell everything, aquatic products, marshmallows, their own calligraphy works, strings and so on, which feels like a small market.
Don't worry about the relevant personnel to check, just experience the happiness of "practicing stalls" and feel that it is not easy for parents to make money.