I have two accepted papers in one conference . The problem is that until I have not gotten an original invitation letter, a must to get a visa. I've sent over ten emails to the email addresses listed on the conference website to the organizers and chairperson asking for this letter; no response. I do not have anyone else who can present in my place. If I failed to attend the conference because of this, would my papers be published in the conference proceedings?
To be part of the proceedings, the paper needs to be presented at the conference.
I have seen two cases where the paper was presented despite physical absence of the authors. In the first case, the paper was presented by one of the authors via a Skype call. In the second case, a befriended researcher of the authors gave the presentation.