Considering the.... Interesting situation around Akechi they probably expected it to happen at some point and continued on as though Akechi were never there

Mm, I think they all knew every one xould be disposed of at any point and kept going as if nothing had happened

How did they deal with Shiho going missing?

I assume you meant to say Shido, but still, he didn't go missing, he had a change of heart and the election was put on hold, right?