Thank you to everyone who voted and gave me input! I'm going to run the Sezuri-kai (voice loss) mushi this week, I think. Tentative schedule is as follows:
Post 1: Sunday morning EST / Sunday evening Japanasialia: First post (shells on the beach of the lake, to start the voice-loss-ness)
Post 2: Sometime during the week: effects~ (Part of the lake turning red and bloody and icky; ginko warning about the mushi)
Post 3: Next weekend-ish (probably Sunday): Ending post. (birds coming out of the shells, etc.)
... which is v. v. tentative, yes. BASICALLY: the mushi themselves will be there a week, and I'll throw up three posts to bookend the event. I'm planning on running it this week, buuut we'll how much time I have. etc.