1N-VAR 暑期课程 A summer school is an educational course on a particular subject that is run during the summer. The students usually stay at the place where the summer school is being held. 暑期课程 [mainly British]
...a summer school for young professional singers.
为年轻的专业歌手开设的暑期课程
2N-VAR 暑期班Summer school is a summer term at a school, college, or university, for example for students who need extra teaching or who want to take extra courses. 暑期班 [mainly US]