Dear category theorists, As many of you know, Topos Institute is a new non-profit research institute, dedicated to using category theory and related disciplines to shape technology for public benefit. You can find our 2021 retrospective in our blog https://topos.site/blog/. We've had a very successful colloquium in 2021 consisting of around 40 talks—both pure and applied—from speakers such as Awodey, Baez, Riehl, Avigad, and many more. A complete list—as well as slides and links to YouTube videos—can be found here https://topos.site/topos-colloquium/ The colloquium will start again in February 2022. If you'd like to sign up for announcements, please send an email to seminars+subscribe@topos.institute (with any content or subject line; it will all be ignored by the automated system.) If you need to contact us for something else, email us at info@topos.institute We'd love to have you join us next year! Best regards, and happy holidays, David, for the team at Topos [For admin and other information see: http://www.mta.ca/~cat-dist/ ]