Unintentionally Left Out Authors I'm presenting a poster at a conference in the coming months and I unintentionally left out authors (the senior authors) on my work due to my lack of familiarity with the submission program on the website. Unfortunately, I did not go back to correct this until it was too late and the deadline for adjustments had passed.

I'm now faced with presenting the poster without all authors listed on the poster. I'm fairly embarrassed that I let this happen. I've reached out to the organizers and was told no more adjustments can be made. How do I handle it from here? Do I just disclose during presentation that I unintentionally left them out and credit them at that point?
It is what it is, at least as far as the official program is concerned -- tell the missing author about it and apologize.

What's more important in practice is that all authors are listed on the actual poster you will be presenting. That's what people really see and will notice, so make sure it is complete.