Hi there:
if you´re looking for a place in Europe where you can see an unusual number of male longhairs, then you should go to Frankfurt Musikmesse (usually in March, though this year it was mid-April). I was there just yesterday, and again I came away with the impression of having been in a long-hair community almost. I saw more than a dozen men with healthy waist-length manes; one of them had blonde full curly hair that was cut straight just above his behind and looked as if he could grow it much longer if he wanted to. And I´m not talking yet about the dozens of males with mid-back hair that I met in the aisles. A wonderful place for long-hair lovers to be, I can tell you - and that also goes for those who love the sight of long-haired women (though I didn´t see knee-length female hair yesterday, I have seen such long hair there more often than not, and at least one or two ladies with hair well past their behinds every year since I´ve started visiting the Musikmesse. What a pity I had decided to leave my camera at home!