Where can I find summer workers?

Well, if you are eighteen, you can get a summer job. I suggest you try a nearby restaurant or a small shop like a tea shop. Generally walking in the street, you will see many recruitment posts posted at the door of the store. If you can recruit people over eighteen and think you can, you can try! Of course, you can also try short-term work in the online part-time area, such as handing out leaflets or something. Good luck!