Hello everyone. As in the past two years, we are organizing an Applied Category Theory conference and an adjoint school. This year the conference will take place on July 6-10, 2020. The research part of the school will be held during the week June 29-July 3, 2020. Both activities will take place at MIT <http://web.mit.edu/>. The applications for the school are now open, the deadline is January 15, 2020. The mentors and projects are going to be: - Michael Johnson, *Categories of Maintainable Relations <https://www.appliedcategorytheory.org/adjoint-school-act-2020/categories-of-maintainable-relations/>* - Nina Otter, *Diagrammatic and algebraic approaches between persistence modules <https://www.appliedcategorytheory.org/adjoint-school-act-2020/diagrammatic-and-algebraic-approaches-between-persistence-modules/>* - Valeria de Paiva,* Dialectica categories of Petri nets <https://www.appliedcategorytheory.org/adjoint-school-act-2020/dialectica-categories-of-petri-nets/>* - Michael Shulman, *A practical type theory for symmetric monoidal categories <https://www.appliedcategorytheory.org/adjoint-school-act-2020/a-practical-type-theory-for-symmetric-monoidal-categories/>* More information can be found at www.appliedcategorytheory.org. The school is open to anyone, from anywhere in the world, who is interested in applying category-theoretic methods to problems outside of pure mathematics. This is emphatically not restricted to math students, but one should be comfortable working with mathematics. Knowledge of basic category-theoretic language—the definition of monoidal category for example—is encouraged. We will consider advanced undergraduates, PhD students, post-docs, as well as people working outside of academia. Members of minorities, and of any groups which are underrepresented in the mathematics and computer science communities, are especially encouraged to apply. For how to apply, see the link https://www.appliedcategorytheory.org/adjoint-school-act-2020/act-school-202... . <https://www.appliedcategorytheory.org/adjoint-school-act-2020/act-school-2020-how-to-apply/> For any questions or doubts please write us at the address* act adjoint school at gmail dot com*. Sincerely, The organizers - Carmen Constantin, Eliana Lorch, and Paolo Perrone. [For admin and other information see: http://www.mta.ca/~cat-dist/ ]