The above is an extensive collection of links to online talks and conferences in math and sciences, with an option to filter in subject and topic.
- https://cmsa.fas.harvard.edu/literature-lecture-series/. A stellar lecture series hosted at Harvard
Analysis & PDE
The above is an online Analysis and PDE seminar that is organized by UCI and several other schools.
- https://dms.umontreal.ca/~cornea/Seminar.html. Hosted jointly by Montreal, Princeton/IAS, Tel Aviv and Paris
- https://sites.google.com/view/virtual-symplectic-geometer The Western Hemisphere Virtual Symplectic Seminar