We are happy to announce that the 109th Peripatetic Seminar on Sheaves and Logic (PSSL 109) is set to take place over the weekend from November 15th until November 17th in the heart of Leiden, the Netherlands. The event will be held in a hybrid format so that even those who are unable to travel can participate. We gather a few highlights below; further details can be found on the PSSL 109 webpage. Registration There are no registration fees, but we ask that you complete the registration form found here even if you plan to attend remotely. Deadline: November 1st (AoE). Submitting proposals for contributed talks We seek proposals for contributed talks on all aspects of category theory and its applications. Talks about work in progress are also warmly welcomed. We especially encourage PhD students and young researchers to submit their work. As PSSL is an informal gathering, there will be no formal proceedings. In order to submit a talk, please send a pdf containing the details of your proposal (title, speaker name, abstract) to Chase Ford: m.c.ford[at]liacs.leidenuniv.nl Invited speakers We will have invited talks from Paolo Perrone (University of Oxford) and Maaike Zwart (IT University of Copenhagen). Kind regards, Chase Ford Leiden University You're receiving this message because you're a member of the Categories mailing list group from Macquarie University. To take part in this conversation, reply all to this message. View group files<https://outlook.office365.com/owa/categories@mq.edu.au/groupsubscription.ashx?source=EscalatedMessage&action=files&GuestId=6bf90c14-94d1-45b7-a0b5-9dd447734d27> | Leave group<https://outlook.office365.com/owa/categories@mq.edu.au/groupsubscription.ashx?source=EscalatedMessage&action=leave&GuestId=6bf90c14-94d1-45b7-a0b5-9dd447734d27> | Learn more about Microsoft 365 Groups<https://aka.ms/o365g>