>> Thus my suggestion that many this could be a multi-hub experiment.
Yes, many international / transnational events are shifting to a multi-hub approach. Over the ease of participants, there is also a sustainability argument [1]. So I second this, and not just experimentally. What are the problems in going multi-hub?
[1] https://journals.ametsoc.org/view/journals/bams/105/1/BAMS-D-23-0160.1.xml
regards. Shashank
The task is not impossible.