I'm not in ML, but in PL and HCI almost all conferences have proceeded on-schedule, just in a virtual format. The only exception I'm aware of is HOPL (History

I'm not in ML, but in PL and HCI almost all conferences have proceeded on-schedule, just in a virtual format. The only exception I'm aware of is HOPL (History of Programming Languages). They still published the papers/proceedings as usual, but have postponed a physical gathering instead of meeting virtually because the conference convenes only once every 10-15 years.