Since August 2021, I've been organizing a reading group on contemporary philosophy of mathematics. See our website here.
Since August 2020, I've been part of a reading group on étale cohomology at SU and KTH. We've been mostly following Milne, but recently transitioned to Fu. The group has been dormant for some time now.
In the spring of 2020, I participated in a reading group on Lurie's Higher Algebra at SU.
Since Oktober 2021, I'm participating in an online reading group on derived algebraic geometry, which has transformed into a group on derived arithmetic intersection theory. It's organized on the Algebraic Topology server on Discord.