Final answer:
Aven made friends with Andy at soccer tryouts.
Step-by-step explanation:
According to the given information, Aven made friends with Andy at soccer tryouts. While at summer camp, Aven introduced Andy to the other kids and allowed him to share stories about his family. Andy made an effort to introduce himself to the other students and even apologized to Lucas, which led to them becoming fast friends. Over time, Andy also made friends with several other campgoers. It is mentioned that Andy practiced music regularly during camp and became one of the top students by the end. Therefore, Aven made friends with Andy at soccer tryouts.