Category Theory OctoberFest is an informal meeting, covering all areas of category theory and its applications. It is traditionally held in October.

Current Meeting

Octoberfest 2019 will be hosted at Johns Hopkins University, Baltimore, Maryland, over the last weekend of October, the 26th/27th. The meeting will start on the morning of Saturday the 26th and end the following afternoon. As is tradition, we will have a plenary talk on Friday the 25th, joint with the Johns Hopkins Category Theory seminar. Mike Shulman will give the plenary talk on the theme of internal languages.

Venue Details and Speakers

All activity will occur on the Johns Hopkins Homewood campus, details to follow.

Travel and Accommodation Information

We will be competing with “Parent's Weekend” at JHU for hotel space, so attendees are urged to arrange accommodation as soon as proves convenient. Below we have some suggestions for hotels near to the Homewood Campus, or easily accessible via public or hotel transport.

Although there are several airports in surrounding areas, we urge those flying to use Baltimore Washington International as it is the closest and is a short train-journey away from the city. In particular the MARC train runs between the airport and Penn. station, and the Purple Circulator stops at the station.

“Registration” and Talk Submission

Although registration is optional, we do encourage those wishing to attend to send an email to with subject “Registration” so that we can obtain an approximate headcount. There is no deadline for registration.

Those wishing to speak should instead send an email to 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.

Previous Meetings

  • 2018, CUNY
  • 2017, CMU
  • 2015, University of Ottawa
  • 2012, Concordia
  • 2011, University of Ottawa
  • 2010, Dalhousie
  • 2009, CMU
  • 2008, Concordia
  • 2006, University of Ottawa
  • 2005, University of Ottawa
  • 2004, McGill University
  • 1999, McGill University
  • 1995, McGill University