With apologies, the correct URL for the OA Mandate Challenge is http://www.openaccessweek.org/events/oa-mandate-adoption-challenge rather than XX http://www.openaccessweek.org/events/oa-mandate-adoption-challenge-1 because of a software error. Please use the first URL, without the -1 at the end, not the second, otherwise the software just takes you to an error page. Many thanks, Stevan