This is what actually happened. Andres Aullet was comming to Norwich UEA, and then the car had a failure, so they had to go back to london and the presentation was cancelled.
Fortunately for us, most of the people who attended the meeting (about 60) were interested in running a questions/answers session so some of us did it. Later we screened a dvd about Oaxaca (Thanks to Fernando for borrowing it).
As far as I understand, Andres did attend the rest of his scheduled agenda in others UK universities. (Comment from Wet_Ahuizote)