I would like to suggest the Wednesday Night Jazz Jam Sessions at Kaffee Schwarz as an option for things to do at night. This session takes place once a week and is organized by the musicians themselves, most of them are either students or graduates from the Music Academy in Leipzig or other professional musicians. Every week a new band is featured followed by an open jam. The standard is high and one never knows what is going to happen at a session. It normally starts at 9 pm in the evening. I think Kaffee Schwarz is a good location atmospherically and that is reflected in the mood of both musicians and audience. The food is also excellent and there's a good selection of drinks. Located just off the #7 tram line just across the street from the Diakonissen Krankenhaus it is easy to reach.