Dear all, The first meeting of the Tallinn–Tartu category theory seminar <https://tetrapharmakon.github.io/kass/> (KASS) will take place in Tallinn on 9th October 2026. Modelled on other regional CT seminars, KASS seeks to draw together the community of researchers and students across the Department of Software Science at Tallinn University of Technology, and the Institutes of Computer Science and Mathematics at the University of Tartu, as well as participants from the wider locality beyond. Meetings will alternate between Tallinn and Tartu, and will combine research talks with informal discussion, including work in progress. All are welcome, and we particularly encourage PhD students to present their work. A tentative programme may be found on the website <https://tetrapharmakon.github.io/kass/>. Best regards, The Organizers