FOURTH ANNOUNCEMENT CT2017: INTERNATIONAL CONFERENCE ON CATEGORY THEORY AND ITS APPLICATIONS July 16-22, 2017 University of British Columbia Vancouver, Canada Dear Colleagues, This is a reminder of the following deadlines coming up this month. May 15: Early Bird registration closes at 3:59PM PST May 31: Deadline for submission of abstracts You may register for CT2017 and also reserve accommodation through the PIMS website at http://www.pims.math.ca/scientific-event/170716-c2ictc Please book accommodation early because the room block set aside for CT2017 is limited in size. See the PIMS website for details. This conference will be held on the University of British Columbia campus. It will begin with a reception at 4pm on Sunday July 16, 2017, and will end at 1pm on Saturday July 22, 2017. All those interested in category theory and its applications are welcome to register. Invited Speakers D. Hofmann, R. Lucyshyn-Wright M. Menni R. Pare T. Van der Linden We are pleased to announce a Special Invited Lecture at CT2017 by Bill Lawvere. In an event related to CT2017, a set of expository talks by graduate students will be presented by the Kan Extension Seminar on Tuesday afternoon July 18 Scientific Committee M. M. Clementino M. Gran G. Janelidze(Chair) P. T. Johnstone J. L. MacDonald S. Mantovani R. H. Street W. P. Tholen Organizing Committee M. Christiansen(Chair) J. L. MacDonald J. Picado Abstracts may be submitted to ct2017@mat.uc.pt from now until May 31, 2017. Selection of speakers from these submissions will be made shortly after that date. A latex template for the abstracts has been included in the webpage with address http://www.mat.uc.pt/~ct2017 I hope to see many of you in Vancouver in July. Lauchie MacDonald [For admin and other information see: http://www.mta.ca/~cat-dist/ ]