CAUTION: The Sender of this email is not from within Dalhousie. Dear all, We are happy to announce the Open House on Category Theory 2021. A short, informal meeting which ideally would have taken place in México but, because of the covid pandemic, will take place online; 18-19 November 2021. We will seize the occasion to celebrate Francisco 'Quico' Marmolejo's 60th birthday, so we particularly encourage talks on Pseudo-monads, distributive laws, Toposes and/or Axiomatic Cohesion. If you would like to assist, please send a message to matias.menni@gmail.com including your name and affiliation. If you would also like to give a talk, you need only include the title and abstract in your message. Further information may be found on the meeting's website. https://sites.google.com/view/catcat-2021-en/inicio Best regards, Matías Menni and Luis Turcio. [For admin and other information see: http://www.mta.ca/~cat-dist/ ]