Some links to good places to go in Stockholm:
Göta Källare The place where the gig is going to be!
Here is a map. The club resides in a corner of
Götgatan which is sort of a main avenue of many pubs and restaurants. There's a hotel on the other side of the street of the gig place as well. Götgatan is mostly a centre of action in good ways.
Södermalm resides near to that and it takes only 15 minutes walk through
Folkungagatan and
Renstiernas Gata to
Skonegatan near to the park you could see in the map above. The park area is a lively, beautiful and humane place where people and families tend to spend their time on weekends in Summer. Some good footie pubs near to that too.
Sound PollutionThis is a great metal/rock/punk record shop in
Stora Nygatan in the centre of the (very) Old Town in the middle of Stockholm. There are lots of old buildings and tight avenues. Better watch out you don't loose your money to tourist shops here...