You've got to go at least once...

Make having a draft here the reward for finding it. I recommend seek it out on foot while wandering around the surrounding hutongs of the Forbidden City (which have plenty of interesting little gems of all sorts... odd museums and galleries, restaurants, parks etc.) then arrive in the early evening and wait for the band to arrive. A good place to have music and local conversation in the midst of history. It's been quite a while and I'd say a lot of the local bands, new and old, have played at least a gig or two here.