You can find XLR cables, regular 1/4 cables and mic stands in the little shops behind the Sichuan Conservatory of Music just tell a taxi driver to go to 川音 ”chuan yin“ and do some window shopping. Jah Bar and Macchu Picchu have open mic, Jah bar is more reggae/rock and has a PA and drums whereas Macchu Picchu is more acoustic and folk.
“Ffficial” Jah bar jams are on Thursday but a lot of people also play on Friday and Saturday.
Macchu Picchu is pretty open to acoustic jams whenever, the owners are cool guys.