Dear colleagues, We are pleased to invite you to the annual days of the LHC workgroup (Logic, Homotopy, Cateogries), which will take place in Paris (around Irif lab) on 6 and 7 June 2023 Those will be followed by two days of conferences in honour of Fran??ois M??tayer, on the occasion of his retirement, on 8 and 9 June 2023 which should also be of interest to LHC people. The invited speakers of that conference are - Albert Burroni, IMJ, UPC - L??onard Guetta, postdoc in Max Planck Institut, Bonn - Amar Hadzihasanovi?? , Tallinn University of Technology - Simon Henry, University of Ottawa - Andr?? Joyal, Universit?? du Qu??bec ?? Montr??al - Muriel Livernet, IMJ, UPC - Philippe Malbos, Universit?? Claude Bernard Lyon 1 - Georges Maltsiniotis, IMJ, UPC - Samuel Mimram, ??cole Polytechnique - Alain Prout??, membre ?? la retraite de l'IMJ, UPC Participation to both events is free but registration is mandatory and can be performed, before the *29 May 2023*, at https://framaforms.org/lhc-days-2023-francois-metayer-days-1681303855 As usual, proposals for presentations are welcome for the LHC workgroup, we count on you for this! Also, in order to ease the organization, please try not to wait until the last minute to register. More information can be found on the following webpages: - LHC days: https://smimram.gitlabpages.inria.fr/lhc/journees.html - M??tayer days: https://smimram.gitlabpages.inria.fr/lhc/francois.html See you soon! Pierre-Louis Curien <curien@irif.fr> (local organizer) Yves Guiraud <guiraud@imj-prg.fr> (local organizer) Samuel Mimram <samuel.mimram@lix.polytechnique.fr> (LHC coordinator) Lionel Vaux Auclair <lionel.vaux@univ-amu.fr> (LHC coordinator) [For admin and other information see: http://www.mta.ca/~cat-dist/ ]