If by manifestations you mean the tar creatures — they started taking shape as of 10 July :) Up to you whether you want Eleven to be pursued by one, of course!

I've purposefully avoided giving a concrete timeline so folks can back/forward date as they need, since there's a lot happening — take what measures you need, from that point of view! I admit I'd assumed you might want to top level a log starter, case in which that wouldn't be a problem :)))