| September 19, 2019 | Alice B. Tumpach (Université de Lille, France) | Bruhat-Poisson structure of the restricted Grassmannian and the KdV hierarchy |
| September 26, 2019 | Anton Mellit (University of Vienna) | The curious hard Lefschetz property for character varieties |
| September 27*, 2019 | Oscar Garcia-Prada (ICMAT Madrid) | BWAG |
| October 3, 2019 | Gergely Harcos (Renyi MTA, Budapest) | A Minkowski-type result for linearly independent subsets of ideal lattices |
| October 10, 2019 | Ben Davison (University of Edinburgh) | Positivity for quantum canonical bases for cluster algebras |
| October 17, 2019 | Umberto Zannier (Scuola Normale Superiore, Italy); (tbc) | Bounded height in pencils of finitely generated subgroups |
| October 24, 2019 | Fernando R. Villegas (ICTP Trieste) | Integral factorials ratios and mixed Hodge numbers |
| October 31, 2019 (UNUSUAL PLACE: Uni Vienna) | Francois Loeser (Sorbonne Université) | BWAG |
| November 7, 2019 | Nadir Fasola (SISSA, Trieste) | |
| November 14, 2019 | Yang Cao (University of Hannover) | |
| November 21, 2019 | Jochen Heinloth (University of Duisburg-Essen) | |
| November 28, 2019 | Rachel Newton (University of Reading, UK) | |
| December 5, 2019 | Hulya Arguz (University of Versailles St-Quentin) | |
| December 12, 2019 | Daniel Huybrechts (University of Bonn) | |
| December 19, 2019 | Jessica Fintzen (University of Cambridge) | |
| January 09, 2020 | Arthur Forey (ETH Zürich) | Uniform bound for points of bounded degree in function fields of positive characteristic |
| January 16, 2020 | Adeel Khan (University of Regensburg) | Intersection theory of derived stacks |
| January 23, 2020 | Fabien Pazuki (University of Copenhagen) | Regulators of number fields and abelian varieties. |
| March 05, 2020 | Lenny Taelman (University of Amsterdam) | Derived equivalences of hyperkähler varieties |
| March 12, 2020 | Ulrich Derenthal (University of Hannover) | Postponed |
| March 19, 2020 | Georg Oberdieck (University of Bonn) | Postponed |
| March 26, 2020 | Pavel Safronov (University of Zurich) | Postponed |
| April 02, 2020 | Balazs Szendroi (University of Oxford) | Hilbert schemes of points on singular surfaces: combinatorics, geometry, and representation theory |
| April 09, 2020 | Cong Xue (University of Cambridge) | Cohomology of stacks of shtukas |
| April 16, 2020 | Dimitri Wyss (EPFL) | Postponed |
| April 23, 2020 | Yuuji Tanaka (University of Oxford) | Vafa-Witten invariants on projective surfaces |
| April 30, 2020 | Daniel Fiorilli (Université Paris-Sud) | On the distribution of the error term in Chebotarev’s density theorem and applications |
| May 07, 2020 | Alexis Bouthier | Postponed |
| May 14, 2020 | David Harari (Université Paris-Saclay) | Postponed |
| May 21, 2020 | Sergei Gukov (Caltech/MPI Bonn) | From the Generalized Volume Conjecture to Turaev and Ramanujan |
| May 28, 2020 | Peter Humphries (University College London) | Small scale equidistribution of lattice points on the sphere |
| June 04, 2020 | Hélène Esnault (Freie Universität Berlin) | Postponed |
| June 11, 2020 | Dimitri Wyss (EPFL) | P-adic integration, geometry and Higgs bundles. |
| June 18, 2020 | Vladimir Dokchitser (University College London) | Postponed |
| June 18, 2020 | Junliang Shen (MIT Mathematics) | On the topology of Hitchin fibrations |
| June 19, 2020 | Richard Wentworth (University of Maryland) | BWAG |
