Most Universities will offer chinese course, so just go check out some that are near to you. Unfortunately MOST dont offer evening, Strictly day, although some might, some offer weekends as well.  As for strictly part time, Most that I have seen dont have part time. But most people that are here working in China treat it like part time anyways. You treat it seriously for a month or so, then start going less and less. They already got your money, they dont seem to care that much.  Also, just google the universities. They will usually have an english page specifically for this, so you can get alot of your information without leaving the house.

i can exchange language with you, i work in HAIDIAN,live in CHANGPING,if you would ,PM me ,please