The classes are usually in USTC, Sundays, 6-9 pm.
Apart from that, some special salsa and bachata classes are being arranged from time to time with teachers from Nanjing and Shanghai.
Almost every Wednesday are people dancing salsa, bachata and merengue in a bar called Friends in Huizhou Lu. They could provide you more information in this place, they are very open and friendly. I can introduce you some of them. They use a Wechat Group to be in contact.
Best,