Acoustic punk shows? Really? I want to hear more about that!
There are numerous acoustic punk acts. Locally, one name that stick to mind was Brat and the different incarnations of Freddie Fagot. Drop Kick Murphys come to mind with more international renown, (although they do also feature electric instruments). The .357 String Band Comes to mind as well, definitely a punk aesthetic involved in their act, musically however they run much closer to bluegrass than folk. Great guys to boot.