I don't want to seem miserable but.. is this really a good idea?
I mean, I know the intent is good, but.. well, first off, isn't their randomly dropping on people sort of both the idea and the charm? And second.. wouldn't publicising a timetable like this only spoil it by setting a large number of people on the GM, subsequently making the events, seemingly intended to be limited-number-to-one in nature, difficult to work, if not wholly unworkable? I'm pretty sure that's why the GM's aren't publicising the timetables for this in the first place, and I'm pretty sure that's why this is different from the 'other threads for battles etc'.
I.. really cannot escape the conclusion that the best case scenario is the GM's will see your work here.. and move to foil it by appearing at different times (if they aren't already, by randomising it). And in the worse case it might spoil what's intended to give a special little experience to a few lucky people by unfairly forcing them to share, when the idea is that the 'for everyone' bit is the published article.
Much as I really do hope I get to participate in one of these spontaneous events someday, I certainly wouldn't want the opportunity to come about like that, so.. sorry.