Middle school students want to set up a stall in the night market during the summer vacation. What should they sell?

Recommend a small department store buyer, but it must be trendy and eye-catching and grasp the psychology of modern youth, because most consumers are teenagers. We have a shop called Guoguo in the street here, which sells stationery, toys, trinkets, mirrors, comic novels, posters (all the latest) and hats. There are countless things like xo tf. In winter, I sell scarves, hand warmers, Christmas presents, chocolate roses on Valentine's Day, lanterns on New Year's Day, classroom decorations and colorful balloons on school holidays, and most importantly, I sell some strange gadgets, really. Of course, you can't sell all the night market stalls, but you must aim at the blank. Selling things that others didn't expect to sell must be novel, and it doesn't have to be sold in the night market. The square is very attractive, and children or students usually go there. Those novel things are very attractive to them.