In Finland, there has often been extensive cross-over of noise and power electronics and other genres of music. This includes not only live shows, but also labels/distributors, and naturally the people in general.
You have people like Keränen playing from "hipster festivals", to warm of some sort of action rock or whatever. You got Umpio playing with just about any kind of bands, from sludge to noiserock to punk/grind/hc. Bizarre Uproar and Grunt has played in several big and small (black) metal gigs and festivals. Actually it seems to be fact that for example Grunt has played much more at black metal gigs than "pure noise gigs" for 10 years. Also warming up bands like Eyehategod or such or warming up big electro-goth bands in gothic festival, hah... Jaakko Vanhala warmed up Jex Thoth, which was probably quite shock for some listeners who came for "female fronted doom", and face full blast harsh noise attack. And so on. I think in Joensuu region, there has been lots of cross-over of noise and some sort of "techno" stuff.
And so on. It is very usual this happens. And over here, I don't think it is anything made out to be so "special". Crowd is surprisingly same, whatever genre you pick. Sweetest neo folk may be one step from most brutal harsh noise.
While labels like Freak Animal as "label", is exclusively experimental stuff, most people are aware they get vast variety of other underground music from same place. My strong assumption is that it's not like this everywhere in the world, but over here mixed shows are nothing unusual.