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@Daevin Yes. Actually yesterday I read that all talks will be pre-recorded, so my problem is solved. It was still super interesting and helpful to read all the comments and answers.
@PLL Yes. The thing is not if I should allow the 2nd author to present, but whether not presenting could mean missing some career opportunity. I always had the chance to present, so I never thought about that, and wanted to get opinions for more experienced people.