Dear all, CT Octoberfest 2019 will be held at Johns Hopkins University, Baltimore on the 26th and 27th of October. The meeting is free and open to all. All details, including instructions on contributing a talk or ``registering'', and accommodation and travel recommendations, are available on the website: https://ct-octoberfest.github.io . In conjunction with Octoberfest we are pleased to announce a plenary talk, joint with the Johns Hopkins Category Theory seminar, on Friday the 26th of October: Mike Shulman will be talking on the theme of internal languages. Those wishing to speak should send an email to ctoctoberfest19@math.jhu.edu with the subject ``Submission'' including the submission title and any notes or special requests. The talk submission deadline is the 25th of September, anywhere on earth. For any queries related to the meeting please do not hesitate to contact tslil clingman at tslil@jhu.edu or the meeting email address ctoctoberfest19@math.jhu.edu. We hope to see you there! [For admin and other information see: http://www.mta.ca/~cat-dist/ ]