I'm calling about the evening classes you offer.

我打电话是想询问你们开设的夜校课程。

youdao

When Disney recruited on campus for a work-study program, Mr. Saied leapt at the chance to spend a semester at Disney World, taking evening classes on the company's approach to business.

CENTERFORSECURITYPOLICY: An insight into the fifth column

The training also involves evening classes and examinations.

FORBES: Careers

Their problem is solved once they start attending evening classes at the village school.

UNESCO: Education