Math Seminars
Google calendar for online math seminars (organized by Ao Sun, Mingchen Xia)
Facebook online math seminars page
Online math seminars in your local time! (organized by Jaume de Dios)
Algebra, Geometry, and Combinatorics
Western hemisphere virtual symplectic seminar [Join]
Symplectic Zoominar
Geometry and Topology Online (Warwick)
Virtual Seminar on Geometry and Topology [join]
Zoom Algebraic Geometry Seminar
F-seminar [join]