As many of you already know from previous announcements, CATEGORY THEORY 2013 will take place at Macquarie University (Sydney) from 7 to 13 July. Those wishing to speak are now invited to submit an abstract via the conference website: http://web.science.mq.edu.au/groups/coact/seminar/ct2013/ The deadline for submitting your abstract is 1 MAY 2013. The invited speakers are: Eugenia Cheng (Sheffield) Pieter Hofstra (Ottawa) Zurab Janelidze (Stellenbosch) Emily Riehl (Harvard) Michael Shulman (IAS) Ross Street (Macquarie) A workshop "Applications of Category Theory" will be held at Macquarie the week before the conference, and another workshop "General Algebra and Applications" will be held in Melbourne the week after. See the conference website for details. A further announcement will be made when registration opens. Best wishes, Tom Leinster on behalf of the scientific committee: Maria Manuel Clementino Marcelo Fiore Marino Gran Stephen Lack Tom Leinster Robert Par? Myles Tierney -- 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/ ]