I am a co-organizer (and am the American Mathematical Society contact for) the "Recent Advances in Diffeology and their Applications" special session at the joint international AMS-SMF-EMS conference. It was scheduled to occur in July 2021, but due to the pandemic, has been postponed until July 2022.
Nov 1 2020 → Jul 31 2022
AMS-SMF-EMS Joint Internat. Meeting, Grenoble, July 2021 - Special Session "Recent Advances in Diffeology and their Applications", France