I'm mostly familiar with the Oslo scene, which has Hackeriet[0] (of which I'm still a member) with more of a CCC-style crowd and Bitraf[1] which has a lot of physical equipment for "makers" and has a much larger space. Hackeriet's IRC channel is also quite nice (though usually in Norwegian and/or svorsk).

There's a few other organisations, notably Teknologihuset[2] which has some communities organising regular events and NUUG[3] which doesn't have a physical space but moves around and is generally a good community to get in contact with.

Note that NUUG have members all throughout Norway, and also an active (Norwegian) IRC channel, which may be a good place to ask about other towns as my knowledge of those is either outdated or non-existing!

Ses på IRC! :)

[0]: https://hackeriet.no [1]: https://bitraf.no/ [2]: https://www.teknologihuset.no/ [3]: https://nuug.no