I don't think I've yet to experience anything as incredible as the DIY punk scene in my teenage years. People from multiple communities around Chicago would show up at an abandoned transmission gallery and renovate enough of it to make it inhabitable for a show that night. The dedication was purely out of love for the scene itself and it's a shame I haven't found a parallel in modern adulthood.
I also don't know mmuch about the 1960s hippie culture firsthand, of course.
But my "impression" of the 1990s rave scene was that indeed it was in between the punk ethos (DIY, warehouse takeovers, some aggressive music styles like gabber/hardcore) and the hippie ethos (bohemian, some psychedelic influence, etc.) At any rate you did get that sense of "for the scene" with the rave community, something that is indeed special when you can find it.
For all I know there are some scenes similar to that still, but it's hard to keep up with this sort of thing -- it's hard to reconcile a late-hours youth culture with responsible 9-5 job culture. :( It would be interesting to know for sure what has taken its place.