Well, that's a problem. One I never anticipated on top of that. Thanks for calling this out!
What you need to do to progress is go into the main mansion's west wing and talk with Jeannie, who is in front of the conference room. You're being stopped from doing that because a switch is active from something you did earlier to make Viridius mad at you.
It's a simple enough problem to fix - I just added some conditional checks for the summit being active - so that's done for v0.23, but unfortunately I don't see a way for you to continue without the bug being fixed. So, I put a patch into the latest change log. There's instructions on how to apply it there as well.
Let me know if it works (or doesn't work) for you.
(and sorry for taking so long to get back to you, this past week has been very hectic)