Dear all, The original deadline for submitting abstracts to Category Theory 2013 (Macquarie University, Sydney) was 1 May. This has now been extended to 1 June. However, if you have not already submitted an abstract and intend to do so, please email me by 10 May declaring your intention to submit. Abstracts themselves should be submitted via the conference website, http://web.science.mq.edu.au/groups/coact/seminar/ct2013/ Best wishes, Tom Leinster (on behalf of the scientific committee) -- The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336. [For admin and other information see: http://www.mta.ca/~cat-dist/ ]