If you like DJ events with commercial pop music and aren’t against spending a few euros on entrance fees, clubs like Cirkus Club or Square Club are great destinations.
Bars like Parlament Pub or Holidays’ Pub (on the weekend) offer a similar experience on a smaller scale but without charging entry fees.
And for an alternative scene, you can visit one of the clubs in Metelkova Art Center or K4 Club for techno music.
You can read more about all these party places at Ljubljana Clubs and Ljubljana Bars.