Statement by the event organisers about what happened if anyone is interested:
http://www.kristianwilliams.com/
I realise this is pure conspiracy theory and I don't have a shred of evidence to back this up, but part of me wonders whether intersectionality/privilege theory and that whole subculture is somehow being promoted by intelligence agencies in order to stop the left from organising effectively at a time when there was some potential to resonate with the general public. It does seem to have had that effect, but it is probably more symptom than cause of failure.
Interestingly enough, it sprung to dominance on the UK far left precisely at the moment that the tuition fees protests burned out. At the University I was at back then, while large demonstrations were still taking place, there was one occupation which was had a fairly practical function - it served as a centre for organising the necessary legwork involved in publicising the next demo, reaching out to trade unions, picketing lib dems, raising funds for transport, discussions and talks and so on. After the last major demo ended, momentum had wound down and the bulk of students lost interest, there was then a second occupation, now based on "safe space" principles (first time I heard the word) and was far smaller, more exclusive, inward looking and didn't seem to serve any particular function as such, with an emphasis on form over content. This then preceded a series of lefty fall outs and the scene went from solidarity to toxicity soon after.
My point is it seems like this sort of thing is what happens when you have people wanting to engage in radical politics but without any particular mass movement or groundswell of unrest to attach on to. I can't imagine this sort of thing being big in Spain or Greece for example where there are actually things happening outside for the radical milieu to focus their attention on.