You can go to Masuo Bar in the north of Pumart in Happiness Middle Road and ask about it. There is also a Zunhuang Entertainment next to it, which is also a similar place. You can ask.
There is another one, west of Baolong Square and east of Su Guo Fair Price Store. There is a slow roll bar, which used to be a ballroom. You can also ask if there is a DJ in it.
I don't know anywhere else ~ ~
Suqian is a relatively small city, and the choice of DJ is still relatively small. You can try a big city.