I.. Are you sure you're in Stockholm? Because this doesn't sound familiar to the scene I know at all. We've got a pretty big "underground" scene.
If you want bass music (Dubstep/DnB etc), hit up
All Out Dubstep, you've also got
Vidrig and Subsonic (both do DnB/Dubstep/Filth). Also
Traffic DnB
There's also a fairly big psytrance scene, check out Private Crew/Technostate.
There's also the
Monday Bar Cruises that tend to play a variety of styles (everything from hard trance to psy to hardstyle)
Then there's a pretty large variety of smaller events that tend to throw "everything goes" parties,
these guys play everything from Hardstyle to UKHC & Darkpsy, and their parties are usually pretty cool.
I think you're just looking at the wrong places.
I.. Are you sure you're in Stockholm? Because this doesn't sound familiar to the scene I know at all. We've got a pretty big "underground" scene.