Helifan
Im sure your going to have a hard time on getting names. Establishments although they say they will try and help, most times protect these folks as a lot of them are established criminals or in criminal gangs. The establishments are not going to "Rock the Boat".
If you wish to protect those from future problems advise them to go in numbers to these places and keep from getting loud etc... Your playing on their turf.
If someone wishes to just settle this one particular score, that can be done but best not discussed on this forum.....