Bristol Junior Geometry Seminar.
Geometry & Topology Seminar.
Some geometry/topology/groups people in Bristol who have websites:
September 2022: Call to defend bodily autonomy in the mathematics community (one can sign at the link).
May 2021: Just Mathematics Collective statement on collaboration with the NSA. Some signatories had a response (pdf) from the AMS. Letter to AMS Notices responding to the response.
June 2020: Boycott of mathematical collaboration with police.