I do not have the full info but the word behind the scenes is that all four Author Events staffers put in their four weeks' notice today, planning to wrap up their projects, and then they were all four fired and lost email and building access effective immediately.
So the follow-up email stating that the team "submitted their resignations, effective immediately" is incorrect. What I don't know is what instigated the mass resignation, who sent the "all events canceled" email, or how they will host the full event schedule without the experienced team.