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@Paolo Perrone: are you aware that the MIT Categories seminars conflict with the HoTTEST seminars?
I wonder if it would be possible for the two to be shifted slightly, so that they don't overlap, considering that there will be probably be a significant overlap in people interested in both, now that they're happening online
though if they're being recorded, it's maybe not such a problem (apart from not being able to ask questions at both)