Dear all, In celebration of Martín Escardó's 60th birthday this year, we are pleased to announce a two-day workshop on *17–18 December 2025* at the *University of Birmingham*. https://tdejong.com/mhe60 The full list of over 20 invited speakers can be found on the website and reflects Martín's diverse contributions to constructive mathematics, domain theory, locale theory, logic, topology and homotopy/univalent type theory. The workshop is co-located with the Midlands Graduate School (MGS) Christmas Seminar on 16 December 2025 and will support remote participation. If you would like to attend (in person or remotely), please register by *21 November 2025* by completing this form: https://forms.cloud.microsoft/e/4GgaZHTxad We hope to see many of you there, Tom de Jong (tom.dejong@nottingham.ac.uk) Eric Finster (e.l.finster@bham.ac.uk) 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/groups/groupsubscription?source=EscalatedMessage&action=files&smtp=categories%40mq.edu.au&bO=true&GuestId=6bf90c14-94d1-45b7-a0b5-9dd447734d27> | Leave group<https://outlook.office365.com/groups/groupsubscription?source=EscalatedMessage&action=leave&smtp=categories%40mq.edu.au&bO=true&GuestId=6bf90c14-94d1-45b7-a0b5-9dd447734d27> | Learn more about Microsoft 365 Groups<https://aka.ms/o365g>