We are absolutely puzzled by how many speakers either ghost our acceptance email or respond with "sorry, turns out I can't travel then", not in a "sorry, something came up, and my plans fell through" kind of a way but in a "I never even thought about if I would be able to go" kind of a way. That simply just doesn't compute, we just assumed that everyone that submitted a talk to us and didn't check "need to present remotely" already had tentative plans to come and present. We are not sure what to do about those that aren't responding, we don't want to name and shame them but we want to give them every opportunity to respond. If anyone has any thoughts on how to reach those who aren't responding, please let us know. Otherwise, we'll just revoke their acceptance and go with the alternative. At this rate, we'll run out of alternatives, so if you received a rejection, we may be backtracking on that if you are still willing to present.