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As it turns out we both need to read more on this. The university refused to disinvite her but she has refused to attend unless the university will guarantee that she doesn’t face strident opposition. The part of the quote from her about having things thrown at hear appears to reference an incident at a past appearance in which she was glitterbombed.

http://www.independent.co.uk/news/people/germaine-greer-will-not-give-cardiff-university-lecture-because-of-abuse-over-views-on-transgender-a6707236.html